Roger Clemens had a record of 152-89 with an ERA of 3.02 and 2,101 strikeouts in 305 appearances between the 1990 and 1999 seasons.
| NAME | SEASON | TM | G | W | L | W% | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | K/9 | BB/9 | K/BB | HR/9 | K% | BB% | WHIP | BABIP | RA | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | R. Clemens | 1990 |  BOS | 31 | 21 | 6 | .778 | 31 | 1.93 | 209 | 7 | 4 | 0 | 228.1 | 193 | 49 | 59 | 7 | 54 | 7 | 0 | 3 | 920 | 8 | 8.24 | 2.13 | 3.87 | 0.28 | 22.7 | 5.9 | 1.08 | .289 | 2.33 | 47 | 2.17 | 55 | 7.61 | 44.8 |
| 2 | | R. Clemens | 1991 | BOS | 35 | 18 | 10 | .643 | 35 | 2.62 | 241 | 13 | 4 | 0 | 271.1 | 219 | 79 | 93 | 15 | 65 | 5 | 0 | 12 | 1,077 | 6 | 7.99 | 2.16 | 3.71 | 0.50 | 22.4 | 6.0 | 1.05 | .272 | 3.08 | 61 | 2.57 | 63 | 7.26 | 44.5 |
| 3 | | R. Clemens | 1992 | BOS | 32 | 18 | 11 | .621 | 32 | 2.41 | 208 | 11 | 5 | 0 | 246.2 | 203 | 66 | 80 | 11 | 62 | 9 | 0 | 5 | 989 | 3 | 7.59 | 2.26 | 3.35 | 0.40 | 21.0 | 6.3 | 1.07 | .275 | 2.92 | 58 | 2.53 | 64 | 7.41 | 39.2 |
| 4 | | R. Clemens | 1993 | BOS | 29 | 11 | 14 | .440 | 29 | 4.46 | 160 | 2 | 1 | 0 | 191.2 | 175 | 95 | 99 | 17 | 67 | 11 | 0 | 4 | 808 | 3 | 7.51 | 3.15 | 2.39 | 0.80 | 19.8 | 8.3 | 1.26 | .286 | 4.65 | 99 | 3.68 | 85 | 8.22 | 13.4 |
| 5 | | R. Clemens | 1994 | BOS | 24 | 9 | 7 | .563 | 24 | 2.85 | 168 | 3 | 1 | 0 | 170.2 | 124 | 54 | 62 | 15 | 71 | 4 | 0 | 1 | 692 | 4 | 8.86 | 3.74 | 2.37 | 0.79 | 24.3 | 10.3 | 1.14 | .251 | 3.27 | 57 | 3.61 | 77 | 6.54 | 20.4 |
| 6 | | R. Clemens | 1995 | BOS | 23 | 10 | 5 | .667 | 23 | 4.18 | 132 | 0 | 0 | 0 | 140.0 | 141 | 65 | 70 | 15 | 60 | 14 | 0 | 0 | 623 | 9 | 8.49 | 3.86 | 2.20 | 0.96 | 21.2 | 9.6 | 1.44 | .313 | 4.50 | 86 | 4.19 | 90 | 9.06 | 6.8 |
| 7 | | R. Clemens | 1996 | BOS | 34 | 10 | 13 | .435 | 34 | 3.63 | 257 | 6 | 2 | 0 | 242.2 | 216 | 98 | 106 | 19 | 106 | 4 | 0 | 2 | 1,032 | 8 | 9.53 | 3.93 | 2.42 | 0.70 | 24.9 | 10.3 | 1.33 | .305 | 3.93 | 71 | 3.42 | 70 | 8.01 | 39.1 |
| 8 |  | R. Clemens | 1997 |  TOR | 34 | 21 | 7 | .750 | 34 | 2.05 | 292 | 9 | 3 | 0 | 264.0 | 204 | 60 | 65 | 9 | 68 | 12 | 0 | 1 | 1,044 | 4 | 9.95 | 2.32 | 4.29 | 0.31 | 28.0 | 6.5 | 1.03 | .294 | 2.22 | 45 | 2.24 | 50 | 6.95 | 66.3 |
| 9 | | R. Clemens | 1998 | TOR | 33 | 20 | 6 | .769 | 33 | 2.65 | 271 | 5 | 3 | 0 | 234.2 | 169 | 69 | 78 | 11 | 88 | 7 | 0 | 0 | 961 | 6 | 10.39 | 3.38 | 3.08 | 0.42 | 28.2 | 9.2 | 1.10 | .271 | 2.99 | 57 | 2.65 | 59 | 6.48 | 49.2 |
| 10 |  | R. Clemens | 1999 |  NYY | 30 | 14 | 10 | .583 | 30 | 4.60 | 163 | 1 | 1 | 0 | 187.2 | 185 | 96 | 101 | 20 | 90 | 9 | 0 | 0 | 822 | 8 | 7.82 | 4.32 | 1.81 | 0.96 | 19.8 | 10.9 | 1.47 | .306 | 4.84 | 98 | 4.35 | 91 | 8.87 | 9.1 |
| Total | 305 | 152 | 89 | .631 | 305 | 3.02 | 2,101 | 57 | 24 | 0 | 2177.2 | 1,829 | 731 | 813 | 139 | 731 | 82 | 0 | 28 | 8,968 | 59 | 8.68 | 3.02 | 2.87 | 0.57 | 23.4 | 8.2 | 1.18 | .286 | 3.36 | 66 | 3.02 | 68 | 7.56 | 333 |
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