| 1963-04-08 | @ WS2 | 1 | W 3-1 | 1-0 | 1 | 43,022 | Steve Barber | Don Rudolph | Steve Barber | Don Rudolph | Stu Miller | 3 | 1 | 2 |
| 1963-04-10 | vs WS2 | 2 | W 3-2 | 2-0 | 1 | 26,859 | Robin Roberts | Claude Osteen | Wes Stock | Steve Hamilton | | 6 | 3 | 3 |
| 1963-04-11 | @ NYA | 3 | W 4-1 | 3-0 | 1 | 30,374 | Milt Pappas | Whitey Ford | Milt Pappas | Whitey Ford | | 10 | 4 | 6 |
| 1963-04-13 | @ NYA | 4 | L 1-6 | 3-1 | 1 | 22,899 | Steve Barber | Ralph Terry | Ralph Terry | Steve Barber | | 11 | 10 | 1 |
| 1963-04-14 | @ NYA | 5 | L 1-5 | 3-2 | 2 | 18,638 | Chuck Estrada | Stan Williams | Stan Williams | Chuck Estrada | | 12 | 15 | -3 |
| 1963-04-16 | @ BOS | 6 | L 1-6 | 3-3 | 4 | 26,161 | Robin Roberts | Bill Monbouquette | Bill Monbouquette | Robin Roberts | | 13 | 21 | -8 |
| 1963-04-17 | @ BOS | 7 | W 5-4 | 4-3 | 3 | 8,389 | Steve Barber | Earl Wilson | Steve Barber | Earl Wilson | Stu Miller | 18 | 25 | -7 |
| 1963-04-19 | vs CLE | 8 | W 8-5 | 5-3 | 2 | 13,548 | Milt Pappas | Pedro Ramos | Wes Stock | Ron Nischwitz | Stu Miller | 26 | 30 | -4 |
| 1963-04-20 | vs CLE | 9 | W 8-1 | 6-3 | 1 | 4,715 | Dave McNally | Mudcat Grant | Dave McNally | Mudcat Grant | | 34 | 31 | 3 |
| 1963-04-21 | vs CLE | 10 | W 7-0 | 7-4 | 1 | 0 | Steve Barber | Sam McDowell | Steve Barber | Sam McDowell | | 41 | 31 | 10 |
| 1963-04-21 | vs CLE | 11 | L 0-2 | 7-4 | 1 | 23,228 | Robin Roberts | Dick Donovan | Dick Donovan | Robin Roberts | | 41 | 33 | 8 |
| 1963-04-23 | vs MIN | 12 | W 1-0 | 8-4 | 1 | 4,055 | Milt Pappas | Dick Stigman | Milt Pappas | Dick Stigman | | 42 | 33 | 9 |
| 1963-04-24 | vs KC1 | 13 | L 0-5 | 8-5 | 3 | 3,159 | Mike McCormick | Orlando Pena | Orlando Pena | Mike McCormick | | 42 | 38 | 4 |
| 1963-04-25 | vs KC1 | 14 | W 3-2 | 9-5 | 1 | 4,390 | Steve Barber | Dave Wickersham | Steve Barber | John Wyatt | | 45 | 40 | 5 |
| 1963-04-26 | vs LAA | 15 | L 3-4 | 9-6 | 2 | 8,864 | Robin Roberts | Ken McBride | Eli Grba | Stu Miller | | 48 | 44 | 4 |
| 1963-04-27 | vs LAA | 16 | W 4-2 | 10-6 | 1 | 5,462 | Dave McNally | Bo Belinsky | Dave McNally | Bo Belinsky | Dean Stone | 52 | 46 | 6 |
| 1963-04-28 | vs LAA | 17 | L 2-3 | 10-7 | 4 | 9,034 | Milt Pappas | Dean Chance | Dean Chance | Pete Burnside | | 54 | 49 | 5 |
| 1963-04-30 | @ MIN | 18 | L 1-8 | 10-8 | 4 | 5,635 | Steve Barber | Camilo Pascual | Camilo Pascual | Steve Barber | | 55 | 57 | -2 |
| 1963-05-01 | @ CHA | 19 | L 0-7 | 10-10 | 5 | 16,717 | Mike McCormick | Ray Herbert | Ray Herbert | Mike McCormick | | 55 | 64 | -9 |
| 1963-05-01 | @ CHA | 20 | L 4-6 | 10-10 | 5 | 16,717 | Robin Roberts | Joe Horlen | Joe Horlen | Robin Roberts | Hoyt Wilhelm | 59 | 70 | -11 |
| 1963-05-02 | @ CHA | 21 | W 8-7 | 11-10 | 5 | 10,501 | Dave McNally | Juan Pizarro | Dean Stone | Gary Peters | Stu Miller | 67 | 77 | -10 |
| 1963-05-03 | @ DET | 22 | W 8-5 | 12-10 | 4 | 10,953 | Chuck Estrada | Don Mossi | Wes Stock | Paul Foytack | | 75 | 82 | -7 |
| 1963-05-04 | @ DET | 23 | W 8-4 | 13-10 | 3 | 5,396 | Steve Barber | Jim Bunning | Steve Barber | Jim Bunning | | 83 | 86 | -3 |
| 1963-05-05 | @ DET | 24 | L 4-12 | 13-11 | 4 | 5,732 | Dick Hall | Phil Regan | Tom Sturdivant | Dick Hall | | 87 | 98 | -11 |
| 1963-05-07 | vs BOS | 25 | L 1-5 | 13-12 | 6 | 6,431 | Robin Roberts | Earl Wilson | Earl Wilson | Robin Roberts | | 88 | 103 | -15 |
| 1963-05-08 | vs BOS | 26 | W 10-4 | 14-12 | 5 | 5,914 | Steve Barber | Gene Conley | Steve Barber | Gene Conley | | 98 | 107 | -9 |
| 1963-05-09 | vs BOS | 27 | W 4-1 | 15-12 | 2 | 4,679 | Chuck Estrada | Bill Monbouquette | Chuck Estrada | Bill Monbouquette | Stu Miller | 102 | 108 | -6 |
| 1963-05-10 | vs NYA | 28 | W 6-3 | 16-12 | 2 | 26,685 | Mike McCormick | Whitey Ford | Dick Hall | Hal Reniff | | 108 | 111 | -3 |
| 1963-05-11 | vs NYA | 29 | L 1-13 | 16-13 | 3 | 12,171 | Dave McNally | Stan Williams | Steve Hamilton | Dave McNally | | 109 | 124 | -15 |
| 1963-05-12 | vs NYA | 30 | L 0-2 | 16-14 | 5 | 23,435 | Steve Barber | Jim Bouton | Jim Bouton | Steve Barber | | 109 | 126 | -17 |
| 1963-05-14 | @ WS2 | 31 | W 6-1 | 17-14 | 5 | 5,057 | Robin Roberts | Dave Stenhouse | Robin Roberts | Dave Stenhouse | | 115 | 127 | -12 |
| 1963-05-15 | @ WS2 | 32 | W 7-1 | 18-14 | 4 | 5,864 | Milt Pappas | Tom Cheney | Milt Pappas | Tom Cheney | | 122 | 128 | -6 |
| 1963-05-16 | vs WS2 | 33 | W 9-1 | 19-14 | 3 | 3,893 | Chuck Estrada | Don Rudolph | Chuck Estrada | Don Rudolph | Dick Hall | 131 | 129 | 2 |
| 1963-05-18 | vs CHA | 34 | W 2-1 | 20-14 | 2 | 16,349 | Steve Barber | Gary Peters | Steve Barber | Hoyt Wilhelm | | 133 | 130 | 3 |
| 1963-05-19 | vs CHA | 35 | W 4-3 | 21-15 | 2 | 0 | Robin Roberts | Juan Pizarro | Robin Roberts | Juan Pizarro | | 137 | 133 | 4 |
| 1963-05-19 | vs CHA | 36 | L 3-4 | 21-15 | 2 | 16,179 | Mike McCormick | Ray Herbert | Jim Brosnan | Dean Stone | | 140 | 137 | 3 |
| 1963-05-20 | vs DET | 37 | W 6-0 | 22-15 | 1 | 5,969 | Milt Pappas | Phil Regan | Milt Pappas | Phil Regan | | 146 | 137 | 9 |
| 1963-05-21 | vs DET | 38 | W 4-2 | 23-15 | 1 | 4,773 | Chuck Estrada | Mickey Lolich | Chuck Estrada | Mickey Lolich | Dick Hall | 150 | 139 | 11 |
| 1963-05-22 | vs DET | 39 | W 2-1 | 24-15 | 1 | 10,608 | Steve Barber | Jim Bunning | Steve Barber | Jim Bunning | Wes Stock | 152 | 140 | 12 |
| 1963-05-23 | vs WS2 | 40 | W 6-0 | 25-15 | 1 | 4,555 | Robin Roberts | Claude Osteen | Robin Roberts | Claude Osteen | | 158 | 140 | 18 |
| 1963-05-24 | @ CLE | 41 | W 7-4 | 26-15 | 1 | 6,744 | Mike McCormick | Sam McDowell | Mike McCormick | Sam McDowell | Dave McNally | 165 | 144 | 21 |
| 1963-05-25 | @ CLE | 42 | W 6-4 | 27-15 | 1 | 2,789 | Milt Pappas | Pedro Ramos | Stu Miller | Bob Allen | | 171 | 148 | 23 |
| 1963-05-26 | @ CLE | 43 | W 10-6 | 29-15 | 1 | 0 | Steve Barber | Dick Donovan | Wes Stock | Dick Donovan | Stu Miller | 181 | 154 | 27 |
| 1963-05-26 | @ CLE | 44 | W 6-1 | 29-15 | 1 | 8,209 | Chuck Estrada | Mudcat Grant | Wes Stock | Mudcat Grant | | 187 | 155 | 32 |
| 1963-05-28 | @ KC1 | 45 | W 4-2 | 30-15 | 1 | 13,739 | Robin Roberts | Ted Bowsfield | Robin Roberts | Ted Bowsfield | Stu Miller | 191 | 157 | 34 |
| 1963-05-29 | @ KC1 | 46 | L 4-5 | 30-16 | 1 | 12,987 | Mike McCormick | Dave Wickersham | Bill Fischer | Dean Stone | | 195 | 162 | 33 |
| 1963-05-30 | @ KC1 | 47 | L 2-7 | 30-17 | 1 | 17,794 | Steve Barber | Ed Rakow | Ed Rakow | Steve Barber | John Wyatt | 197 | 169 | 28 |
| 1963-05-31 | @ LAA | 48 | L 4-7 | 30-18 | 1 | 9,172 | Milt Pappas | Dan Osinski | Dan Osinski | Milt Pappas | Julio Navarro | 201 | 176 | 25 |
| 1963-06-01 | @ LAA | 49 | L 1-7 | 30-19 | 2 | 12,696 | Chuck Estrada | Ken McBride | Ken McBride | Chuck Estrada | | 202 | 183 | 19 |
| 1963-06-02 | @ LAA | 50 | L 2-8 | 30-20 | 2 | 11,745 | Robin Roberts | Dean Chance | Dean Chance | Robin Roberts | Julio Navarro | 204 | 191 | 13 |
| 1963-06-04 | vs NYA | 51 | W 3-1 | 31-20 | 1 | 39,472 | Steve Barber | Ralph Terry | Steve Barber | Ralph Terry | Dick Hall | 207 | 192 | 15 |
| 1963-06-05 | vs NYA | 52 | L 3-4 | 31-21 | 2 | 24,934 | Milt Pappas | Whitey Ford | Whitey Ford | Milt Pappas | | 210 | 196 | 14 |
| 1963-06-06 | vs NYA | 53 | W 4-2 | 32-21 | 1 | 28,005 | Robin Roberts | Jim Bouton | Dick Hall | Stan Williams | | 214 | 198 | 16 |
| 1963-06-08 | vs BOS | 54 | L 1-7 | 32-22 | 1 | 11,768 | Steve Barber | Bill Monbouquette | Bill Monbouquette | Steve Barber | | 215 | 205 | 10 |
| 1963-06-09 | vs BOS | 55 | L 2-3 | 32-23 | 2 | 6,357 | Milt Pappas | Earl Wilson | Dick Radatz | Stu Miller | | 217 | 208 | 9 |
| 1963-06-10 | vs CLE | 56 | L 2-3 | 32-24 | 2 | 9,470 | Mike McCormick | Barry Latman | Barry Latman | Mike McCormick | Ted Abernathy | 219 | 211 | 8 |
| 1963-06-11 | vs CLE | 57 | L 5-9 | 32-25 | 3 | 20,193 | Robin Roberts | Mudcat Grant | Mudcat Grant | Robin Roberts | Ted Abernathy | 224 | 220 | 4 |
| 1963-06-12 | @ NYA | 58 | L 2-3 | 32-26 | 3 | 20,369 | Dave McNally | Ralph Terry | Marshall Bridges | Stu Miller | | 226 | 223 | 3 |
| 1963-06-13 | @ NYA | 59 | W 5-4 | 33-26 | 3 | 21,828 | Steve Barber | Whitey Ford | Steve Barber | Bill Kunkel | Dick Hall | 231 | 227 | 4 |
| 1963-06-14 | @ BOS | 60 | L 1-5 | 33-27 | 4 | 18,015 | Milt Pappas | Earl Wilson | Earl Wilson | Milt Pappas | Dick Radatz | 232 | 232 | 0 |
| 1963-06-16 | @ BOS | 61 | L 1-8 | 33-29 | 5 | 0 | Ike Delock | Bill Monbouquette | Bill Monbouquette | Ike Delock | | 233 | 240 | -7 |
| 1963-06-16 | @ BOS | 62 | L 5-12 | 33-29 | 5 | 29,258 | Robin Roberts | Dave Morehead | Dave Morehead | Robin Roberts | Dick Radatz | 238 | 252 | -14 |
| 1963-06-17 | @ BOS | 63 | W 7-2 | 34-29 | 5 | 7,219 | Mike McCormick | Wilbur Wood | Mike McCormick | Wilbur Wood | | 245 | 254 | -9 |
| 1963-06-18 | @ CLE | 64 | L 3-7 | 34-30 | 6 | 6,583 | Dave McNally | Barry Latman | Barry Latman | Dave McNally | | 248 | 261 | -13 |
| 1963-06-19 | @ CLE | 65 | L 4-5 | 35-31 | 5 | 0 | Steve Barber | Pedro Ramos | Ted Abernathy | Stu Miller | | 252 | 266 | -14 |
| 1963-06-19 | @ CLE | 66 | W 6-2 | 35-31 | 5 | 13,150 | Milt Pappas | Gary Bell | Milt Pappas | Gary Bell | | 258 | 268 | -10 |
| 1963-06-20 | @ CLE | 67 | L 8-11 | 35-32 | 6 | 4,304 | Dick Hall | Dick Donovan | Jerry Walker | Dick Hall | Ted Abernathy | 266 | 279 | -13 |
| 1963-06-21 | @ MIN | 68 | L 2-5 | 36-33 | 6 | 0 | Ike Delock | Lee Stange | Lee Stange | Ike Delock | Bill Dailey | 268 | 284 | -16 |
| 1963-06-21 | @ MIN | 69 | W 10-2 | 36-33 | 6 | 22,586 | Robin Roberts | Garry Roggenburk | Robin Roberts | Garry Roggenburk | | 278 | 286 | -8 |
| 1963-06-22 | @ MIN | 70 | L 1-3 | 36-34 | 6 | 17,244 | Mike McCormick | Jim Perry | Jim Perry | Mike McCormick | Bill Dailey | 279 | 289 | -10 |
| 1963-06-23 | @ MIN | 71 | W 4-1 | 37-34 | 6 | 24,679 | Steve Barber | Dick Stigman | Steve Barber | Dick Stigman | Stu Miller | 283 | 290 | -7 |
| 1963-06-24 | @ MIN | 72 | L 4-6 | 37-35 | 6 | 9,223 | Milt Pappas | Jim Kaat | Jim Kaat | Milt Pappas | Bill Dailey | 287 | 296 | -9 |
| 1963-06-25 | @ LAA | 73 | W 10-0 | 38-35 | 5 | 9,442 | Robin Roberts | Dean Chance | Robin Roberts | Dean Chance | | 297 | 296 | 1 |
| 1963-06-26 | @ LAA | 74 | L 1-3 | 38-37 | 6 | 12,075 | Ike Delock | Paul Foytack | Paul Foytack | Ike Delock | Julio Navarro | 298 | 299 | -1 |
| 1963-06-26 | @ LAA | 75 | L 2-3 | 38-37 | 6 | 12,075 | Mike McCormick | Ken McBride | Ken McBride | Mike McCormick | | 300 | 302 | -2 |
| 1963-06-28 | vs KC1 | 76 | W 2-1 | 39-37 | 6 | 18,818 | Steve Barber | Orlando Pena | Steve Barber | Orlando Pena | | 302 | 303 | -1 |
| 1963-06-29 | vs KC1 | 77 | W 3-2 | 40-37 | 6 | 7,780 | Milt Pappas | Moe Drabowsky | Milt Pappas | Moe Drabowsky | | 305 | 305 | 0 |
| 1963-06-30 | vs KC1 | 78 | L 1-3 | 41-38 | 6 | 9,840 | Robin Roberts | Ed Rakow | Bill Fischer | Robin Roberts | | 306 | 308 | -2 |
| 1963-06-30 | vs KC1 | 79 | W 4-3 | 41-38 | 6 | 9,840 | Mike McCormick | Diego Segui | Stu Miller | Bill Fischer | | 310 | 311 | -1 |
| 1963-07-01 | vs KC1 | 80 | L 4-6 | 41-39 | 6 | 5,232 | Dave McNally | Dave Wickersham | Dave Wickersham | Dave McNally | John Wyatt | 314 | 317 | -3 |
| 1963-07-02 | vs LAA | 81 | W 4-3 | 42-39 | 6 | 5,681 | Steve Barber | Paul Foytack | Dick Hall | Paul Foytack | Stu Miller | 318 | 320 | -2 |
| 1963-07-03 | vs LAA | 82 | W 3-1 | 43-39 | 5 | 7,419 | Milt Pappas | Dean Chance | Milt Pappas | Dean Chance | | 321 | 321 | 0 |
| 1963-07-04 | vs LAA | 83 | W 7-4 | 44-39 | 5 | 25,840 | Mike McCormick | Bob Turley | Wes Stock | Bob Turley | | 328 | 325 | 3 |
| 1963-07-05 | vs MIN | 84 | W 4-3 | 45-40 | 6 | 0 | Ike Delock | Ray Moore | Ike Delock | Ray Moore | Stu Miller | 332 | 328 | 4 |
| 1963-07-05 | vs MIN | 85 | L 5-7 | 45-40 | 6 | 19,695 | Robin Roberts | Bill Pleis | Bill Dailey | Herm Starrette | | 337 | 335 | 2 |
| 1963-07-06 | vs MIN | 86 | W 2-1 | 46-40 | 5 | 5,344 | Dave McNally | Dick Stigman | Dave McNally | Dick Stigman | Stu Miller | 339 | 336 | 3 |
| 1963-07-07 | vs MIN | 87 | W 4-3 | 47-40 | 5 | 6,793 | Milt Pappas | Jim Perry | Stu Miller | Jim Kaat | | 343 | 339 | 4 |
| 1963-07-11 | @ WS2 | 88 | W 7-4 | 48-40 | 4 | 9,992 | Robin Roberts | Tom Cheney | Dick Hall | Ron Kline | Stu Miller | 350 | 343 | 7 |
| 1963-07-12 | @ WS2 | 89 | W 4-3 | 49-40 | 4 | 10,788 | Milt Pappas | Bennie Daniels | Wes Stock | Bennie Daniels | Stu Miller | 354 | 346 | 8 |
| 1963-07-13 | @ WS2 | 90 | L 3-4 | 49-41 | 4 | 5,110 | Ike Delock | Jim Duckworth | Steve Ridzik | Dick Hall | | 357 | 350 | 7 |
| 1963-07-14 | @ CHA | 91 | W 6-3 | 50-42 | 4 | 0 | Mike McCormick | Ray Herbert | Mike McCormick | Ray Herbert | Stu Miller | 363 | 353 | 10 |
| 1963-07-14 | @ CHA | 92 | L 2-3 | 50-42 | 4 | 22,607 | Dave McNally | John Buzhardt | Hoyt Wilhelm | Steve Barber | | 365 | 356 | 9 |
| 1963-07-15 | @ CHA | 93 | L 0-4 | 50-43 | 5 | 17,764 | Robin Roberts | Gary Peters | Gary Peters | Robin Roberts | | 365 | 360 | 5 |
| 1963-07-16 | @ DET | 94 | W 5-2 | 51-43 | 5 | 16,725 | Milt Pappas | Frank Lary | Milt Pappas | Frank Lary | Stu Miller | 370 | 362 | 8 |
| 1963-07-17 | @ DET | 95 | L 1-9 | 51-44 | 5 | 5,691 | Steve Barber | Hank Aguirre | Hank Aguirre | Steve Barber | | 371 | 371 | 0 |
| 1963-07-18 | @ DET | 96 | W 8-6 | 52-44 | 5 | 5,124 | Mike McCormick | Phil Regan | Stu Miller | Bill Faul | George Brunet | 379 | 377 | 2 |
| 1963-07-19 | @ KC1 | 97 | L 1-2 | 52-45 | 5 | 7,769 | Dave McNally | Orlando Pena | Orlando Pena | Dave McNally | John Wyatt | 380 | 379 | 1 |
| 1963-07-20 | @ KC1 | 98 | W 6-3 | 53-45 | 5 | 10,293 | Robin Roberts | Dave Wickersham | Robin Roberts | Dave Wickersham | Stu Miller | 386 | 382 | 4 |
| 1963-07-21 | @ KC1 | 99 | L 2-3 | 53-46 | 5 | 10,543 | Milt Pappas | Moe Drabowsky | Moe Drabowsky | Milt Pappas | | 388 | 385 | 3 |
| 1963-07-23 | vs WS2 | 100 | W 4-0 | 54-46 | 5 | 5,894 | Steve Barber | Claude Osteen | Steve Barber | Claude Osteen | | 392 | 385 | 7 |
| 1963-07-24 | vs WS2 | 101 | W 8-5 | 55-46 | 4 | 4,656 | Dave McNally | Bennie Daniels | Dick Hall | Jim Duckworth | | 400 | 390 | 10 |
| 1963-07-25 | vs WS2 | 102 | W 4-2 | 56-46 | 3 | 4,620 | Robin Roberts | Tom Cheney | Robin Roberts | Steve Ridzik | Stu Miller | 404 | 392 | 12 |
| 1963-07-26 | vs CHA | 103 | W 6-0 | 57-46 | 2 | 23,618 | Milt Pappas | Dave DeBusschere | Milt Pappas | Dave DeBusschere | | 410 | 392 | 18 |
| 1963-07-27 | vs CHA | 104 | L 3-5 | 57-48 | 3 | 0 | Steve Barber | Ray Herbert | Ray Herbert | Steve Barber | Jim Brosnan | 413 | 397 | 16 |
| 1963-07-27 | vs CHA | 105 | L 1-10 | 57-48 | 3 | 18,432 | Mike McCormick | Juan Pizarro | Juan Pizarro | Mike McCormick | Jim Brosnan | 414 | 407 | 7 |
| 1963-07-28 | vs CHA | 106 | L 1-4 | 57-49 | 3 | 5,811 | Dave McNally | Gary Peters | Gary Peters | Dave McNally | | 415 | 411 | 4 |
| 1963-07-29 | vs DET | 107 | W 2-1 | 58-49 | 3 | 4,199 | Robin Roberts | Mickey Lolich | Robin Roberts | Mickey Lolich | | 417 | 412 | 5 |
| 1963-07-30 | vs DET | 108 | W 9-0 | 59-49 | 3 | 7,686 | Milt Pappas | Hank Aguirre | Milt Pappas | Hank Aguirre | | 426 | 412 | 14 |
| 1963-07-31 | vs DET | 109 | W 2-1 | 60-49 | 3 | 8,078 | Steve Barber | Frank Lary | Steve Barber | Frank Lary | | 428 | 413 | 15 |
| 1963-08-02 | @ NYA | 110 | W 5-3 | 61-49 | 3 | 27,834 | Robin Roberts | Whitey Ford | Robin Roberts | Whitey Ford | | 433 | 416 | 17 |
| 1963-08-03 | @ NYA | 111 | L 2-3 | 61-50 | 3 | 28,595 | Milt Pappas | Al Downing | Al Downing | Milt Pappas | Bill Stafford | 435 | 419 | 16 |
| 1963-08-04 | @ NYA | 112 | W 7-2 | 62-51 | 3 | 0 | Steve Barber | Ralph Terry | Steve Barber | Ralph Terry | Dick Hall | 442 | 421 | 21 |
| 1963-08-04 | @ NYA | 113 | L 10-11 | 62-51 | 3 | 39,432 | Dave McNally | Jim Bouton | Hal Reniff | Stu Miller | | 452 | 432 | 20 |
| 1963-08-06 | vs CLE | 114 | W 6-4 | 63-51 | 3 | 16,448 | Robin Roberts | Barry Latman | Robin Roberts | Barry Latman | Stu Miller | 458 | 436 | 22 |
| 1963-08-07 | vs CLE | 115 | L 1-4 | 63-52 | 4 | 7,080 | Milt Pappas | Mudcat Grant | Mudcat Grant | Milt Pappas | | 459 | 440 | 19 |
| 1963-08-08 | vs CLE | 116 | L 0-2 | 63-53 | 4 | 7,738 | Steve Barber | Dick Donovan | Dick Donovan | Steve Barber | | 459 | 442 | 17 |
| 1963-08-09 | @ WS2 | 117 | W 7-1 | 64-53 | 4 | 4,486 | Dave McNally | Jim Duckworth | Dave McNally | Jim Duckworth | Dick Hall | 466 | 443 | 23 |
| 1963-08-10 | @ WS2 | 118 | L 5-6 | 64-54 | 4 | 6,408 | Robin Roberts | Bennie Daniels | Steve Ridzik | Stu Miller | Ron Kline | 471 | 449 | 22 |
| 1963-08-11 | @ WS2 | 119 | W 6-2 | 65-54 | 4 | 6,625 | Milt Pappas | Tom Cheney | Milt Pappas | Ron Kline | Stu Miller | 477 | 451 | 26 |
| 1963-08-13 | @ MIN | 120 | W 6-1 | 66-54 | 4 | 26,513 | Steve Barber | Dick Stigman | Steve Barber | Dick Stigman | | 483 | 452 | 31 |
| 1963-08-14 | @ MIN | 121 | L 1-2 | 66-55 | 4 | 25,014 | Robin Roberts | Jim Perry | Bill Dailey | Stu Miller | | 484 | 454 | 30 |
| 1963-08-15 | @ MIN | 122 | L 3-13 | 66-56 | 4 | 22,537 | Milt Pappas | Lee Stange | Lee Stange | Milt Pappas | | 487 | 467 | 20 |
| 1963-08-16 | @ KC1 | 123 | W 4-3 | 67-56 | 4 | 9,004 | Dave McNally | Orlando Pena | Dave McNally | Orlando Pena | Stu Miller | 491 | 470 | 21 |
| 1963-08-17 | @ KC1 | 124 | W 6-1 | 68-56 | 4 | 9,867 | Steve Barber | Ed Rakow | Steve Barber | Ed Rakow | Dick Hall | 497 | 471 | 26 |
| 1963-08-18 | @ KC1 | 125 | L 4-5 | 68-57 | 4 | 5,669 | Robin Roberts | Dave Wickersham | Dave Wickersham | Robin Roberts | Ted Bowsfield | 501 | 476 | 25 |
| 1963-08-21 | vs LAA | 126 | W 7-4 | 69-58 | 4 | 0 | Steve Barber | Don Lee | Steve Barber | Don Lee | Dick Hall | 508 | 480 | 28 |
| 1963-08-21 | vs LAA | 127 | L 2-3 | 69-58 | 4 | 7,837 | Mike McCormick | Dan Osinski | Art Fowler | Mike McCormick | | 510 | 483 | 27 |
| 1963-08-22 | vs LAA | 128 | W 5-1 | 70-58 | 4 | 4,963 | Dave McNally | Dean Chance | Dave McNally | Dean Chance | | 515 | 484 | 31 |
| 1963-08-23 | vs MIN | 129 | W 14-4 | 72-58 | 3 | 13,544 | Milt Pappas | Dick Stigman | Milt Pappas | Dick Stigman | | 529 | 488 | 41 |
| 1963-08-23 | vs MIN | 130 | W 6-2 | 72-58 | 3 | 13,544 | Robin Roberts | Jim Perry | Robin Roberts | Jim Perry | | 535 | 490 | 45 |
| 1963-08-24 | vs MIN | 131 | L 0-1 | 72-59 | 4 | 8,988 | Dick Hall | Lee Stange | Lee Stange | Dick Hall | | 535 | 491 | 44 |
| 1963-08-25 | vs MIN | 132 | L 3-5 | 72-60 | 4 | 6,021 | Steve Barber | Camilo Pascual | Camilo Pascual | Stu Miller | | 538 | 496 | 42 |
| 1963-08-27 | vs KC1 | 133 | L 1-2 | 72-61 | 4 | 5,132 | Robin Roberts | Ed Rakow | Ed Rakow | George Brunet | | 539 | 498 | 41 |
| 1963-08-28 | vs KC1 | 134 | W 3-1 | 73-61 | 4 | 5,256 | Milt Pappas | Dave Wickersham | Milt Pappas | Dave Wickersham | | 542 | 499 | 43 |
| 1963-08-30 | vs NYA | 135 | L 1-4 | 73-62 | 4 | 28,023 | Steve Barber | Al Downing | Al Downing | Steve Barber | | 543 | 503 | 40 |
| 1963-08-31 | vs NYA | 136 | L 3-5 | 73-63 | 4 | 23,256 | Robin Roberts | Jim Bouton | Jim Bouton | Robin Roberts | Hal Reniff | 546 | 508 | 38 |
| 1963-09-01 | vs NYA | 137 | L 4-5 | 73-64 | 4 | 24,037 | Mike McCormick | Ralph Terry | Tom Metcalf | Dick Hall | Hal Reniff | 550 | 513 | 37 |
| 1963-09-02 | @ BOS | 138 | L 3-4 | 73-66 | 4 | 0 | Milt Pappas | Bill Monbouquette | Bill Monbouquette | Milt Pappas | Dick Radatz | 553 | 517 | 36 |
| 1963-09-02 | @ BOS | 139 | L 0-2 | 73-66 | 4 | 17,288 | Dave McNally | Bob Heffner | Bob Heffner | Dave McNally | | 553 | 519 | 34 |
| 1963-09-03 | @ BOS | 140 | W 4-3 | 74-66 | 4 | 2,896 | Steve Barber | Dave Morehead | Steve Barber | Dave Morehead | Stu Miller | 557 | 522 | 35 |
| 1963-09-04 | @ CLE | 141 | W 6-5 | 75-66 | 4 | 2,648 | Robin Roberts | Mudcat Grant | Robin Roberts | Mudcat Grant | Stu Miller | 563 | 527 | 36 |
| 1963-09-06 | vs BOS | 142 | W 6-4 | 77-66 | 4 | 0 | Milt Pappas | Bill Monbouquette | Milt Pappas | Bill Monbouquette | Dick Hall | 569 | 531 | 38 |
| 1963-09-06 | vs BOS | 143 | W 4-2 | 77-66 | 4 | 6,140 | Mike McCormick | Bob Heffner | Mike McCormick | Bob Heffner | | 573 | 533 | 40 |
| 1963-09-07 | vs BOS | 144 | L 1-4 | 77-67 | 4 | 8,630 | Dave McNally | Dave Morehead | Dave Morehead | Dave McNally | Dick Radatz | 574 | 537 | 37 |
| 1963-09-08 | vs BOS | 145 | L 3-6 | 77-68 | 4 | 5,370 | Steve Barber | Gene Conley | Jack Lamabe | Steve Barber | | 577 | 543 | 34 |
| 1963-09-09 | @ CHA | 146 | L 4-9 | 77-69 | 4 | 9,523 | Robin Roberts | Gary Peters | Gary Peters | Robin Roberts | Hoyt Wilhelm | 581 | 552 | 29 |
| 1963-09-10 | @ CHA | 147 | W 2-1 | 78-69 | 4 | 6,955 | Milt Pappas | Frank Baumann | Milt Pappas | Frank Baumann | Stu Miller | 583 | 553 | 30 |
| 1963-09-11 | @ CHA | 148 | L 2-3 | 78-70 | 4 | 7,154 | Mike McCormick | Eddie Fisher | Eddie Fisher | Mike McCormick | | 585 | 556 | 29 |
| 1963-09-13 | @ DET | 149 | L 2-3 | 78-71 | 4 | 10,760 | Steve Barber | Phil Regan | Phil Regan | Steve Barber | | 587 | 559 | 28 |
| 1963-09-14 | @ DET | 150 | L 2-3 | 78-72 | 4 | 5,394 | Robin Roberts | Jim Bunning | Terry Fox | Robin Roberts | | 589 | 562 | 27 |
| 1963-09-15 | @ DET | 151 | W 2-1 | 79-72 | 4 | 7,817 | Milt Pappas | Frank Lary | Milt Pappas | Frank Lary | Stu Miller | 591 | 563 | 28 |
| 1963-09-18 | @ LAA | 152 | W 3-1 | 81-72 | 4 | 0 | Steve Barber | Aubrey Gatewood | Steve Barber | Aubrey Gatewood | Dick Hall | 594 | 564 | 30 |
| 1963-09-18 | @ LAA | 153 | W 7-5 | 81-72 | 4 | 2,372 | Mike McCormick | Ken McBride | Mike McCormick | Ken McBride | Stu Miller | 601 | 569 | 32 |
| 1963-09-19 | @ LAA | 154 | L 2-7 | 81-73 | 4 | 476 | Dave McNally | Bo Belinsky | Bo Belinsky | Dave McNally | | 603 | 576 | 27 |
| 1963-09-20 | vs WS2 | 155 | W 7-6 | 82-73 | 4 | 3,115 | Milt Pappas | Carl Bouldin | Stu Miller | Don Rudolph | | 610 | 582 | 28 |
| 1963-09-22 | vs WS2 | 156 | W 6-3 | 83-74 | 4 | 0 | Robin Roberts | Jack Jenkins | Robin Roberts | Jack Jenkins | Stu Miller | 616 | 585 | 31 |
| 1963-09-22 | vs WS2 | 157 | L 2-4 | 83-74 | 4 | 2,891 | John Miller | Jim Hannan | Jim Hannan | John Miller | Ron Kline | 618 | 589 | 29 |
| 1963-09-24 | vs CHA | 158 | L 0-15 | 83-75 | 4 | 2,661 | Steve Barber | Ray Herbert | Ray Herbert | Steve Barber | | 618 | 604 | 14 |
| 1963-09-25 | vs CHA | 159 | W 10-2 | 84-75 | 4 | 2,017 | Mike McCormick | Gary Peters | Mike McCormick | Gary Peters | Dick Hall | 628 | 606 | 22 |
| 1963-09-27 | vs DET | 160 | W 5-2 | 85-75 | 4 | 3,521 | John Miller | Hank Aguirre | John Miller | Hank Aguirre | Stu Miller | 633 | 608 | 25 |
| 1963-09-28 | vs DET | 161 | W 8-6 | 86-75 | 4 | 2,998 | Dave McNally | Phil Regan | Dave McNally | Phil Regan | Dick Hall | 641 | 614 | 27 |
| 1963-09-29 | vs DET | 162 | L 3-7 | 86-76 | 4 | 2,109 | Wally Bunker | Denny McLain | Denny McLain | Wally Bunker | | 644 | 621 | 23 |