Between the 1998 and 2003 seasons, Pedro Martinez had the best ERA in the AL when pitching at least 1000 innings, with an ERA of 2.26.
| NAME | ERA | IP | G | W | L | W% | GS | SO | CG | SHO | SV | 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 |  | P. Martinez | 2.26 | 1166.2 | 170 | 101 | 28 | .783 | 168 | 1,456 | 21 | 7 | 0 | 851 | 293 | 329 | 77 | 248 | 61 | 1 | 5 | 4,595 | 28 | 11.23 | 1.91 | 5.87 | 0.59 | 31.7 | 5.4 | 0.94 | .281 | 2.54 | 48 | 2.23 | 50 | 6.56 | 296.2 |
| 2 |  | T. Hudson | 3.26 | 1052.0 | 156 | 80 | 33 | .708 | 156 | 796 | 13 | 6 | 0 | 940 | 381 | 427 | 86 | 338 | 35 | 0 | 30 | 4,357 | 35 | 6.81 | 2.89 | 2.36 | 0.74 | 18.3 | 7.8 | 1.21 | .275 | 3.65 | 72 | 3.66 | 80 | 8.04 | 103.3 |
| 3 | | M. Mussina | 3.56 | 1306.1 | 192 | 94 | 61 | .606 | 192 | 1,148 | 22 | 9 | 0 | 1,234 | 517 | 554 | 134 | 269 | 20 | 0 | 10 | 5,314 | 32 | 7.91 | 1.85 | 4.27 | 0.92 | 21.6 | 5.1 | 1.15 | .294 | 3.82 | 79 | 3.31 | 72 | 8.50 | 183.7 |
| 4 | | J. Moyer | 3.73 | 1271.2 | 192 | 96 | 48 | .667 | 192 | 788 | 14 | 5 | 0 | 1,226 | 527 | 566 | 139 | 303 | 49 | 0 | 16 | 5,276 | 14 | 5.58 | 2.14 | 2.60 | 0.98 | 14.9 | 5.7 | 1.20 | .272 | 4.01 | 83 | 4.08 | 91 | 8.68 | 58.5 |
| 5 |  | R. Clemens | 3.73 | 1238.2 | 190 | 97 | 42 | .698 | 190 | 1,217 | 8 | 5 | 0 | 1,114 | 514 | 562 | 118 | 455 | 43 | 0 | 8 | 5,225 | 49 | 8.84 | 3.31 | 2.67 | 0.86 | 23.3 | 8.7 | 1.27 | .294 | 4.08 | 82 | 3.55 | 78 | 8.09 | 139.7 |
| 6 |  | B. Colon | 3.77 | 1177.2 | 177 | 86 | 51 | .628 | 177 | 980 | 23 | 6 | 0 | 1,100 | 493 | 524 | 127 | 441 | 23 | 0 | 20 | 4,946 | 27 | 7.49 | 3.37 | 2.22 | 0.97 | 19.8 | 8.9 | 1.31 | .288 | 4.00 | 80 | 3.99 | 86 | 8.41 | 85.7 |
| 7 | | D. Wells | 4.11 | 1195.2 | 177 | 94 | 43 | .686 | 176 | 795 | 31 | 9 | 0 | 1,279 | 546 | 589 | 141 | 208 | 31 | 0 | 5 | 5,002 | 21 | 5.98 | 1.57 | 3.82 | 1.06 | 15.9 | 4.2 | 1.24 | .297 | 4.43 | 88 | 3.87 | 85 | 9.63 | 94.7 |
| 8 | | A. Pettitte | 4.14 | 1156.1 | 182 | 98 | 54 | .645 | 181 | 833 | 14 | 2 | 0 | 1,256 | 532 | 596 | 98 | 379 | 24 | 0 | 16 | 5,010 | 19 | 6.48 | 2.95 | 2.20 | 0.76 | 16.6 | 7.6 | 1.41 | .315 | 4.64 | 91 | 3.78 | 82 | 9.78 | 101.8 |
| 9 | | B. Radke | 4.23 | 1215.2 | 186 | 74 | 70 | .514 | 186 | 727 | 24 | 6 | 0 | 1,339 | 572 | 605 | 146 | 212 | 37 | 0 | 4 | 5,089 | 16 | 5.38 | 1.57 | 3.43 | 1.08 | 14.3 | 4.2 | 1.28 | .301 | 4.48 | 89 | 4.06 | 90 | 9.91 | 60.8 |
| 10 | | K. Rogers | 4.27 | 1111.2 | 173 | 65 | 47 | .580 | 171 | 630 | 14 | 2 | 0 | 1,196 | 528 | 585 | 108 | 355 | 52 | 0 | 10 | 4,791 | 24 | 5.10 | 2.87 | 1.77 | 0.87 | 13.1 | 7.4 | 1.40 | .298 | 4.74 | 90 | 4.30 | 93 | 9.68 | 38.6 |
| 11 | | T. Wakefield | 4.30 | 1049.2 | 261 | 60 | 53 | .531 | 132 | 803 | 2 | 0 | 22 | 997 | 502 | 570 | 131 | 411 | 62 | 59 | 13 | 4,541 | 29 | 6.89 | 3.52 | 1.95 | 1.12 | 17.7 | 9.1 | 1.34 | .276 | 4.89 | 91 | 4.51 | 101 | 8.55 | -10.8 |
| 12 | | A. Sele | 4.52 | 1126.0 | 185 | 84 | 55 | .604 | 184 | 739 | 10 | 8 | 0 | 1,245 | 566 | 608 | 115 | 386 | 56 | 0 | 21 | 4,940 | 24 | 5.91 | 3.09 | 1.91 | 0.92 | 15.0 | 7.8 | 1.45 | .310 | 4.86 | 98 | 4.27 | 94 | 9.95 | 38.6 |
| 13 | | S. Ponson | 4.60 | 1029.1 | 167 | 55 | 59 | .482 | 156 | 653 | 22 | 2 | 1 | 1,087 | 526 | 557 | 141 | 348 | 17 | 5 | 7 | 4,401 | 24 | 5.71 | 3.04 | 1.88 | 1.23 | 14.8 | 7.9 | 1.39 | .292 | 4.87 | 102 | 4.65 | 100 | 9.50 | -2.5 |
| 14 | | R. Helling | 4.86 | 1007.0 | 161 | 68 | 50 | .576 | 161 | 681 | 9 | 3 | 0 | 1,061 | 544 | 582 | 165 | 365 | 32 | 0 | 15 | 4,372 | 30 | 6.09 | 3.26 | 1.87 | 1.47 | 15.6 | 8.3 | 1.42 | .286 | 5.20 | 101 | 5.05 | 107 | 9.48 | -33.6 |
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| NL East | W | L | PCT | GB |
|---|---|---|---|---|
 Braves - y | 94 | 68 | .580 | |
 Phillies - w | 88 | 74 | .543 | 6.0 |
80 | 82 | .494 | 14.0 | |
77 | 85 | .475 | 17.0 | |
74 | 88 | .457 | 20.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 103 | 59 | .636 | |
 Cubs - w | 89 | 73 | .549 | 14.0 |
82 | 80 | .506 | 21.0 | |
77 | 85 | .475 | 26.0 | |
75 | 87 | .463 | 28.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 100 | 62 | .617 | |
 Padres - w | 91 | 71 | .562 | 9.0 |
86 | 76 | .531 | 14.0 | |
65 | 97 | .401 | 35.0 | |
58 | 104 | .358 | 42.0 |
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Nationals
Mets
Pirates
Cardinals
Reds
Diamondbacks
Giants
Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
 Rays - y | 98 | 64 | .605 | |
 Yankees - w | 93 | 68 | .578 | 4.5 |
 Red Sox - w | 87 | 75 | .537 | 11.0 |
79 | 82 | .491 | 18.5 | |
79 | 83 | .488 | 19.0 | |
| AL Central | W | L | PCT | GB |
 Guardians - y | 85 | 77 | .525 | |
 White Sox - w | 84 | 78 | .519 | 1.0 |
77 | 85 | .475 | 8.0 | |
76 | 86 | .469 | 9.0 | |
69 | 93 | .426 | 16.0 | |
| AL West | W | L | PCT | GB |
 Astros - y | 81 | 81 | .500 | |
80 | 82 | .494 | 1.0 | |
76 | 86 | .469 | 5.0 | |
64 | 98 | .395 | 17.0 | |
62 | 100 | .383 | 19.0 |
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