Jon Lester had the lowest ERA by a left-handed starting pitcher in the postseason when pitching in 15+ games, with an ERA of 2.44.
| NAME | ERA | G | W | L | W% | GS | 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 | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | J. Lester | 2.44 | 22 | 9 | 7 | .563 | 22 | 121 | 0 | 0 | 0 | 143.2 | 110 | 39 | 41 | 14 | 37 | 3 | 0 | 0 | 570 | 3 | 7.58 | 2.32 | 3.27 | 0.88 | 21.2 | 6.5 | 1.02 | .243 | 2.57 | 6.89 |
| 2 |  | W. Ford | 2.71 | 22 | 10 | 8 | .556 | 22 | 94 | 7 | 3 | 0 | 146.0 | 132 | 44 | 51 | 8 | 34 | 3 | 0 | 2 | 594 | 4 | 5.79 | 2.10 | 2.76 | 0.49 | 15.8 | 5.7 | 1.14 | .273 | 3.14 | 8.14 |
| 3 | | T. Glavine | 3.30 | 35 | 14 | 16 | .467 | 35 | 143 | 3 | 0 | 0 | 218.1 | 191 | 80 | 91 | 21 | 87 | 7 | 0 | 11 | 912 | 3 | 5.89 | 3.59 | 1.64 | 0.87 | 15.7 | 9.5 | 1.27 | .260 | 3.75 | 7.87 |
| 4 | | D. Wells | 3.31 | 17 | 10 | 5 | .667 | 17 | 70 | 1 | 0 | 0 | 111.1 | 108 | 41 | 45 | 11 | 19 | 7 | 0 | 1 | 454 | 1 | 5.66 | 1.54 | 3.68 | 0.89 | 15.4 | 4.2 | 1.14 | .280 | 3.64 | 8.73 |
| 5 | | C. Hamels | 3.48 | 16 | 7 | 6 | .538 | 16 | 92 | 1 | 1 | 0 | 98.1 | 81 | 38 | 45 | 12 | 26 | 2 | 0 | 2 | 401 | 1 | 8.42 | 2.38 | 3.54 | 1.10 | 22.9 | 6.5 | 1.09 | .257 | 4.12 | 7.41 |
| 6 |  | R. Johnson | 3.69 | 16 | 5 | 9 | .357 | 16 | 123 | 3 | 2 | 0 | 112.1 | 102 | 46 | 50 | 15 | 29 | 0 | 0 | 1 | 460 | 0 | 9.85 | 2.32 | 4.24 | 1.20 | 26.7 | 6.3 | 1.17 | .297 | 4.01 | 8.17 |
| 7 | | A. Pettitte | 3.81 | 44 | 19 | 11 | .633 | 44 | 183 | 0 | 0 | 0 | 276.2 | 285 | 117 | 121 | 31 | 76 | 3 | 0 | 4 | 1,157 | 4 | 5.95 | 2.47 | 2.41 | 1.01 | 15.8 | 6.6 | 1.30 | .294 | 3.94 | 9.27 |
| 8 |  | CC Sabathia | 4.29 | 23 | 10 | 7 | .588 | 23 | 117 | 1 | 0 | 0 | 128.0 | 135 | 61 | 66 | 15 | 61 | 7 | 0 | 8 | 573 | 5 | 8.23 | 4.29 | 1.92 | 1.05 | 20.4 | 10.6 | 1.53 | .322 | 4.64 | 9.49 |
| 9 |  | C. Kershaw | 4.49 | 32 | 13 | 13 | .500 | 32 | 201 | 0 | 0 | 0 | 184.1 | 159 | 92 | 97 | 27 | 46 | 3 | 0 | 3 | 746 | 10 | 9.81 | 2.25 | 4.37 | 1.32 | 26.9 | 6.2 | 1.11 | .281 | 4.74 | 7.76 |
| 10 |  | F. Valdez | 4.61 | 16 | 6 | 6 | .500 | 16 | 90 | 0 | 0 | 0 | 80.0 | 80 | 41 | 45 | 14 | 32 | 4 | 0 | 0 | 342 | 0 | 10.13 | 3.60 | 2.81 | 1.58 | 26.3 | 9.4 | 1.40 | .327 | 5.06 | 9.00 |
StatMuse has game-level data for ERA and games pitched going back to the 1903 playoffs.
Some of the information used here was obtained free of charge from Retrosheet.
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HR
186
15th
R
786
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1,361
16th
ERA
3.70
5th
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