| 2012-06-10 |
| 2012-07-04 Contract purchased from Pawtucket (AAA) |
| 2012-07-07 | BOS | 29.335 | W 1-6 | vs NYA | 1 | 80 | - | Rel | 5.2 | 5 | 0 | 0 | 0 | 2 | 7 | 82 | 27 | 55 | 67% | 0-0 | 0.00 | 1.17 |
| 2012-07-13 Designated for Assignment |
| 2012-07-19 Traded from Red Sox to Cubs |
| 2012-07-21 | CHN | 29.349 | L 0-12 | @ SLN | 2 | 81 | L | Rel | 3.0 | 5 | 1 | 1 | 0 | 0 | 1 | 45 | 15 | 30 | 67% | 0-1 | 1.00 | 1.33 |
| 2012-07-22 Activated |
| 2012-07-30 | CHN | 29.358 | L 14-4 | vs PIT | 3 | 82 | W | ST | 5.0 | 4 | 2 | 2 | 0 | 2 | 3 | 65 | 20 | 45 | 69% | 1-1 | 1.93 | 1.29 |
| 2012-08-05 | CHN | 29.364 | L 6-7 | @ LAN | 4 | 83 | - | ST | 5.1 | 3 | 2 | 2 | 0 | 0 | 3 | 76 | 29 | 47 | 62% | 1-1 | 2.37 | 1.11 |
| 2012-08-10 | CHN | 30.004 | W 8-10 | vs CIN | 5 | 84 | L | ST | 5.2 | 7 | 6 | 4 | 1 | 2 | 2 | 90 | 33 | 57 | 63% | 1-2 | 3.24 | 1.20 |
| 2012-08-15 | CHN | 30.009 | L 7-2 | vs HOU | 6 | 85 | W | ST | 6.1 | 5 | 2 | 2 | 1 | 1 | 6 | 91 | 33 | 58 | 64% | 2-2 | 3.19 | 1.16 |
| 2012-08-20 | CHN | 30.014 | L 5-9 | @ MIL | 7 | 86 | L | ST | 4.2 | 8 | 7 | 7 | 1 | 1 | 3 | 91 | 37 | 54 | 59% | 2-3 | 4.50 | 1.25 |
| 2012-08-27 | CHN | 30.021 | W 4-15 | vs MIL | 8 | 87 | L | ST | 5.0 | 10 | 5 | 5 | 1 | 0 | 4 | 92 | 33 | 59 | 64% | 2-4 | 5.05 | 1.34 |
| 2012-09-01 | CHN | 30.026 | W 2-5 | vs SFN | 9 | 88 | L | ST | 5.0 | 6 | 5 | 5 | 0 | 2 | 2 | 93 | 36 | 57 | 61% | 2-5 | 5.48 | 1.37 |
| 2012-09-06 | CHN | 30.031 | L 2-9 | @ WAS | 10 | 89 | L | ST | 4.0 | 7 | 7 | 6 | 1 | 2 | 2 | 78 | 33 | 45 | 58% | 2-6 | 6.12 | 1.44 |
| 2012-09-11 | CHN | 30.036 | L 0-1 | @ HOU | 11 | 90 | L | ST | 5.0 | 3 | 1 | 0 | 0 | 2 | 8 | 83 | 31 | 52 | 63% | 2-7 | 5.56 | 1.40 |
| 2012-09-18 | CHN | 30.043 | W 1-3 | vs CIN | 12 | 91 | L | ST | 5.0 | 3 | 3 | 3 | 0 | 5 | 3 | 87 | 37 | 50 | 57% | 2-8 | 5.55 | 1.42 |
| 2012-09-23 | CHN | 30.048 | W 3-6 | vs SLN | 13 | 92 | L | ST | 5.2 | 10 | 4 | 4 | 1 | 1 | 3 | 97 | 34 | 63 | 65% | 2-9 | 5.68 | 1.48 |
| 2012-09-29 | CHN | 30.054 | L 2-8 | @ ARI | 14 | 93 | L | ST | 4.1 | 10 | 7 | 7 | 1 | 1 | 5 | 79 | 25 | 54 | 68% | 2-10 | 6.17 | 1.53 |