Page Information
Current Status
High Level
Proper Name
Jerome Martin Koosman
Stat Years
1965-1985  [mlb] 1967-1985
6-2 / 208
Right / Left
P (612)
Draft Position
Born Date/Place
High School
University of Minnesota-Morris (Morris, Minnesota)
Signed as undrafted free agent by the New York Mets in 1964
Signing Scouts
Red Murff
MLB Debut
1967-04-14 - Boxscore  (Age: 23.113)
Service Time
NYN [12] MIN [3] CHA [3] PHI [2]
ID Numbers
tbc id: 13896 ... retro id: koosj001 ... mlbam id: 117255
Pitch Repertoire
TBC Apps
Career Talent RatingsPitchingStrikeouts66Walks67Hittable53SO/BB75vsPower53Hitting23Durability78Team.484Ratings Explained
Get TBC PREMIUM and remove ads, cleaner display, access to research applications, data store discounts and more!
The TBC Newsletter will keep you periodically up-to-date on what is happening at The Baseball Cube.


top csv share Sort Research Applications: MLB Stats | Minor Stats | College Stats | Draft Research
YearSplitsGGSDNSDNFGS%CGPHPRDRGFfor PHfor PRfor DRb1b2b3b4b5b6b7b8b9p Pp Cp 1Bp 2Bp 3Bp SSp LFp CFp RFp DH
1967Log - Splits936333.30------111213333333339000000000
1968Log - Splits353411797.117311703221935343636343435366535000000000
1969Log - Splits3232016100.01626---103041532323232323131355432000000000
1970Log - Splits302912496.7524---1102942629302931303231305330000000000
1971Log - Splits262422092.3420---202841024242424242424244326000000000
1972Log - Splits3424102070.641611052061625262427242525243934000000000
1973Log - Splits3535023100.012281703252037373535353637405935000000000
1974Log - Splits3535022100.01335---1203693337363637363537416735000000000
1975Log - Splits363422394.411312623841936343534343435376636000000000
1976Log - Splits343221594.117321703042332333333333235346334000000000
1977Log - Splits3232026100.06211602743334343432333233345032000000000
1978Log - Splits383262984.2328---963853332343232333635365638000000000
1979Log - Splits373612697.3107---503333836363837373737374137000000000
1980Log - Splits383442689.585---623384234353534343735353838000000000
1981Log - Splits2716111359.33101291441816171617201717172027000000000
1982Log - Splits4219231645.231912122412621212021222122202542000000000
1983Log - Splits3724132264.92131361542626272425262529262537000000000
1984Log - Splits363423194.4326---603933135343434353834346036000000000
1985Log - Splits191811594.738---501861919181918181917182719000000000
Year Context-dependent but usually self-evident. (Season, Draft Year etc) G Games Played (or Pitched) GS Games Started DNS Did not start. Count of games not started DNF Did not finish. Count of games not finished. GS% Games Started Percentage CG Complete Games PH Pinch hit appearances in games context and Pinch hits in On Base context PR Entered game as Pinch Runner DR Entered game as defensive replacement GF Games Finished for PH Left game for Pinch hitter for PR Left game for Pinch runner for DR Left game for defensive replacement b1 Games at batting slot #1 (Leadoff) b2 Games at batting slot #2 b3 Games at batting slot #3 b4 Games at batting slot #4 (Cleanup) b5 Games at batting slot #5 b6 Games at batting slot #6 b7 Games at batting slot #7 b8 Games at batting slot #8 b9 Games at batting slot #9 p P Games at pitcher position p C Games at catcher p 1B Games at First Base p 2B Games at Second Base p 3B Games at Third Base p SS Games at Shortstop p LF Games at Left Field p CF Games at Center Field p RF Games at Right Field p DH Games as Designated Hitter

On Base

top csv share Sort Research Applications: MLB Stats | Minor Stats | College Stats | Draft Research
1967Log - Splits910585.259.390.435.826412322142201413201000008371551533.331903144020
1968Log - Splits351058969.228.283.327.6102982672211611520664041610510000760317652392335.38692701578130
1969Log - Splits32957864.216.275.308.583259245187140817942941412110000247266561781730.36680901411480
1970Log - Splits30882799.237.297.368.6652602221891351017952572212820000654294753483445.336926017132130
1971Log - Splits26694626.256.309.375.685212174160113151453314128400000447235601691626.6751280194180
1972Log - Splits34691621.250.309.380.690212170155105181372333149410000150236732092027.4051070167670
1973Log - Splits351071965.242.299.348.6473142692341732021433851810710000461336792792734.18760701964141
1974Log - Splits3511181001.258.317.360.6763502712581972723153691685300004613609727172727.848501302077141
1975Log - Splits361018895.261.335.388.72233624623416823211638919115300006663479030113033.339801602264120
1976Log - Splits34994908.226.278.327.6052722552051563716832551910630012249297763193140.79661611471120
1977Log - Splits32940841.232.301.340.641280231195143271685305178630000552286952962930.53811832184131
1978Log - Splits38986866.255.323.357.68031323922116927194733217113300018523099926172626.268401121311880
1979Log - Splits371101999.268.325.393.7193542782681903323505091910810000078393922962931.528301102243140
1980Log - Splits381022925.272.324.415.740326256252172242284524241284000008038410840114037.04690501855120
1981Log - Splits27517464.269.326.384.71016612512596191061154109100000329178501161122.004102077050
1982Log - Splits42726675.287.325.382.707234174194152271673294952110003422587816121620.513805253240
1983Log - Splits37730661.266.324.411.73623517517612119157133319116200001552728229102935.37530112112640
1984Log - Splits36950868.267.315.356.6712952302321791666613788251000010533098115171518.52600911553150
1985Log - Splits19433387.276.336.455.7911441061077069380194146521100137176472662655.3234080113360
Year Context-dependent but usually self-evident. (Season, Draft Year etc) G Games Played (or Pitched) PA Plate Appearances AB At Bats BAVG Batting Average ( H/AB ) OBP On Base Percentage ( H+BB+HBP / (AB+BB+HBP+SF) SLG Slugging Percentage ( TB / AB ) OPS On Base Plus Slugging (OBP + SLG) OB On Base (including Homers) Ldoff Leadoff H Hits 1B-IF Infield Single (or Hit) 1B-OF Outfield Singles 1B-Bnt Bunt Single 2B Doubles 3B Triples HR Home Runs Solo Solo Homers (no baserunners) 2-Run 2-Run Homers 3-Run 3-Run homers Gslam Grand Slams (Bases loaded homer) IPHR Inside the park home run WO-HR Walkoff-homer WO-H Walkoff Hit PH Pinch hit appearances in games context and Pinch hits in On Base context XBH Extra Base Hits (Doubles+Triples+Home Runs) TB Total Bases (Singles + (2*Doubles) + (3*Triples) + (4*Home Runs)) RBI Runs Batted In HR RBI RBIs from home runs RBI Out Runs Batted In on outs RBIHR% Pct of total RBIs from Homers BB Walks BB4 Walkes on 4-pitches, excluding Intentional walks BB 1BO Walked with first base open and runners on 2nd and /or 3rd BB BL Bases Loaded Walk BB LD Leadoff walk IBB Intentional Walks HBP Hit by a Pitch ROE Reached on Error CI Catchers Interference


top csv share Sort Research Applications: MLB Stats | Minor Stats | College Stats | Draft Research
YearSplitsGPAABOutsGOAOGO%FOLOPOFrcFCProdBuntSHSFGDPGDP-OGDP%IF OutOF OutIF Out%loc Ploc Cloc 1Bloc 2Bloc 3Bloc SSloc LFloc CFloc RFSOSO-swSO-caSo-3SO-FTSO Sw%
1967Log - Splits9105856228231.22191360200121020.00321962.75166595591110009.09
1968Log - Splits3510589697462822860.992123836241328662311020.9136720164.6421048797011842837617812100.56
1969Log - Splits329578646872422650.91169356126333171652510723.3634116667.336135574699452605418000000.00
1970Log - Splits308827996072282610.87187205436228975189419.1533315668.121114784641063966511181596012.71
1971Log - Splits266946264711811940.93155112815327997146920.2923314262.1227264747843961429696209.38
1972Log - Splits346916214691591630.9812812231832595775812.0720911364.92093542445925434514700000.00
1973Log - Splits3510719657382813010.93207217328435231962511122.5239818468.4382345927712364665415600000.00
1974Log - Splits35111810017492672940.911992768444391612122111318.5838917269.3351457847312641706118800000.00
1975Log - Splits3610188956662322610.89199194328439171472110320.3932816566.524115684708349674917331501.73
1976Log - Splits349949087092622471.0619029283813518154118712.6434516467.831945728410448635320000000.00
1977Log - Splits329408416452412121.141751819311331394177422.9730215166.72193662829230616019252002.60
1978Log - Splits389868666602612391.091932422425541515111910118.8132717365.439114176689237736316020001.25
1979Log - Splits3711019997242902771.0520862735938141332911026.3637219565.635246929510254647715700000.00
1980Log - Splits3810229256812552770.92213422222344161563010229.4133519763.03064483829049816714900000.00
1981Log - Splits275174643441231450.8511124101421787465211.5416510361.6135254731442640377600000.00
1982Log - Splits427266754871942050.95180141127126556196728.3625614364.22212286158753163498800000.00
1983Log - Splits377306614901982020.981781862213155586013.3327112967.82313347148823848439000000.00
1984Log - Splits369508686332642321.14190132940742141361810217.6533915768.325841777411441665013700000.00
1985Log - Splits19433387281891320.67115891321355463815.791299258.4106203325351637396000000.00
Year Context-dependent but usually self-evident. (Season, Draft Year etc) G Games Played (or Pitched) PA Plate Appearances AB At Bats GO Groundouts AO Air out (Fly Outs + Popouts + Lineouts) FO Fly outs LO Lineouts PO Putouts Frc Forceouts. Groundout with runner ahead of him forced out on base. FC Fielders Choice Prod Productive out. At the very least, a runner was advanced on the out SH Sacrifice Hits SF Sacrifice Flies GDP Grounded into Double Play GDP-O Double Play Opportunities for Batter (Runner on 1st + less than 2 outs) GDP% Grounded into double play percentage. Double Plays vs Opportunities IF Out Infield Outs OF out Outfield Outs IF Out% Percentage of outs in the infield loc P Balls fielded by pitcher loc C Balls fielded by catcher loc 1B Balls fielded by first baseman loc 2B Balls fielded by second baseman loc 3B Balls fielded by third baseman loc SS Balls fielded by shortstop loc LF Balls fielded by left field loc CF Balls fielded by center field loc RF Balls fielded by right field SO Strikeouts SO-Sw Strikeouts Swinging SO-Ca Strikeouts Looking (or Called) SO-3 Strikeouts on 3 Pitches SO-FT Strikeout on Foul Tip SO SW% Percentage of strikeouts on swings


top csv share Sort Research Applications: MLB Stats | Minor Stats | College Stats | Draft Research
1967Log - Splits910541.3901639.02330022001325.0030100.00010.0000272
1968Log - Splits351058298.2827224.1688007700152339.4710855.565935.7108302324
1969Log - Splits32957259.2716525.1097115500132930.9510758.825550.0006352627
1970Log - Splits30882260.2958532.6975206510122631.5815671.432433.3317343620
1971Log - Splits26694212.3056229.251292133002257.41141253.855362.5009271822
1972Log - Splits34691212.3077937.26117406411121938.7114477.787750.0009192011
1973Log - Splits351071314.2939329.6210910101000163034.7821580.773730.0002352829
1974Log - Splits351118350.31310830.862220119810193932.76201262.503537.5008434530
1975Log - Splits361018336.33010531.25191360131210124222.2218966.674450.0008362732
1976Log - Splits34994272.2748029.4163309900113026.8314863.644357.1405443818
1977Log - Splits32940280.29810136.071613309810152438.4618675.006650.0004313119
1978Log - Splits38986313.31710533.55101000131300173135.4215865.228372.7307534122
1979Log - Splits371101354.32210830.517700151500203933.9023971.8861037.5004393740
1980Log - Splits381022326.31911735.8965109900173036.17121152.178850.0005442438
1981Log - Splits27517166.3215935.544310660062221.4317770.83050.0002211410
1982Log - Splits42726234.3228134.625410440093321.4314960.873925.0005282722
1983Log - Splits37730235.3229540.4313751550082127.5914766.675362.50010292213
1984Log - Splits36950295.3119331.531394010901193634.55151451.726746.1508504229
1985Log - Splits19433144.3335538.19972022001224.359469.231233.330419139
Year Context-dependent but usually self-evident. (Season, Draft Year etc) G Games Played (or Pitched) PA Plate Appearances OB On Base (including Homers) mOBP Modified On Base Percentage. Includes all times on base, whether earned or not. R Runs R% Run%. Runs/OnBase. % of time on base that he scores SB Stolen Bases (Total) SB2 Steals of 2nd base SB3 Steals of 3rd base SBH Steals of home CS Caught Stealings CS2 Caught stealing second base CS3 Caught stealing third base CSH Caught stealing home S1-3 1b to 3b on a single while a baserunner S1-2 1b to 2b on a single while a baserunner S1-3% % of times going first to third on a single S2-H 2b to home on a single while a baserunner S2-3 2b to 3b on a single while a baserunner S2-H% % of times second to home on a single D1-H Scored from first base on a double D1-3 1b to 3b on a double D1-H% % of times scoring from first base on a double DI Defensive Indifference. Defense allowed steal without attempt to throw out Adv WP Advanced on Wild Pitch or Passed Ball Adv Out Advanced safely on an out FrcR Forced out as runner. OOB Thrown Out on Bases as baserunner, excludes while batter


top csv share Sort Research Applications: MLB Stats | Minor Stats | College Stats | Draft Research
1967Log - Splits9105851911044222272132064750.0050.0013.6445.4535.000.4235.06.73322.862.861.90
1968Log - Splits35105896969178887533471432391701560.9239.0819.5444.8317.950.0838.51.411711.040.660.09
1969Log - Splits329578646818040000000000---------------0.00---0.00000.000.000.00
1970Log - Splits3088279969118245328216463591572236189662.2536.2013.4749.2328.250.5143.010.95941166.694.651.81
1971Log - Splits266946265196120312246231855781204360.1022.665.9138.4229.490.2955.16.212511.730.720.14
1972Log - Splits346916215114760000000000---------------0.00---0.00000.000.000.00
1973Log - Splits3510719657615640000000000---------------0.00---0.00000.000.000.00
1974Log - Splits35111810018518870000000000---------------0.00---0.00000.000.000.00
1975Log - Splits36101889598173410874344313073402668.5231.483.7067.5958.900.1135.62.6191911.871.870.10
1976Log - Splits349949086620010000000000---------------0.00---0.00000.000.000.00
1977Log - Splits32940841811924142954749244933201266.9033.1022.5465.4952.690.1512.91.33300.320.320.00
1978Log - Splits389868668416084937122001737110675.5124.4922.4575.5154.050.0516.20.62200.200.200.00
1979Log - Splits3711019998315730000000000---------------0.00---0.00000.000.000.00
1980Log - Splits3810229256914950000000000---------------0.00---0.00000.000.000.00
1981Log - Splits27517464417600000000000---------------0.00---0.00000.000.000.00
1982Log - Splits42726675388820000000000---------------0.00---0.00000.000.000.00
1983Log - Splits37730661539060000000000---------------0.00---0.00000.000.000.00
1984Log - Splits369508686013732200022002100.000.000.00100.000.000.00100.00.22220.210.210.21
1985Log - Splits19433387346030000000000---------------0.00---0.00000.000.000.00
Year Context-dependent but usually self-evident. (Season, Draft Year etc) G Games Played (or Pitched) PA Plate Appearances AB At Bats BB Walks SO Strikeouts HBP Hit by a Pitch Pit Pitches Str Strikes Bal Balls SwMs Swing and Miss Cal Called Strikes Swings Batter swung at pitch, regardless of result Foul Foul Balls IntB Intentional Balls InPl Balls put in Play Str% Strike percentage. Total Strikes / Total Pitches Bal% Balls percentage Foul% Foul ball percentage, of all pitches Sw% Swing Percentage. Total Swings / Total Pitches SwMs% Swing and Miss%. When swinging, how much does he miss P/PA Pitches per Plate Appearance IP-SW% Percentage of swings that are put in play IP-PA% % of Plate Appearances where ball is put into play FPS First Pitch Strike FPSw First Pitch Swing FPIP First Pitch in Play FPS% % of Plate Appearances with First Pitch as Strike FPSw% First Pitch Swing Percentage FPIP% First Pitch in Play Percentage