Brett Anderson won the most games for the Oakland Athletics in a season in 2009, with 11 wins in his rookie season.
| NAME | W | SEASON | TM | L | W% | G | 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 |  | B. Anderson | 11 | 2009 | 11 | .500 | 30 | 30 | 4.06 | 150 | 1 | 1 | 0 | 175.1 | 180 | 79 | 94 | 20 | 45 | 3 | 0 | 1 | 735 | 0 | 7.70 | 2.31 | 3.33 | 1.03 | 20.4 | 6.1 | 1.28 | .309 | 4.83 | 94 | 3.68 | 85 | 9.24 | 12.6 | |
| 2 | | T. Cahill | 10 | 2009 | 13 | .435 | 32 | 32 | 4.63 | 90 | 0 | 0 | 0 | 178.2 | 185 | 92 | 99 | 27 | 72 | 4 | 0 | 1 | 773 | 5 | 4.53 | 3.63 | 1.25 | 1.36 | 11.6 | 9.3 | 1.44 | .272 | 4.99 | 107 | 5.32 | 123 | 9.32 | -20.4 | |
| 3 | | D. Braden | 8 | 2009 | 9 | .471 | 22 | 22 | 3.89 | 81 | 0 | 0 | 0 | 136.2 | 144 | 59 | 63 | 9 | 42 | 2 | 0 | 2 | 589 | 1 | 5.33 | 2.77 | 1.93 | 0.59 | 13.8 | 7.1 | 1.36 | .297 | 4.15 | 90 | 3.72 | 86 | 9.48 | 9.1 | |
| 4 | | C. Breslow | 7 | 2009 | 5 | .583 | 60 | 0 | 2.60 | 44 | 0 | 0 | 0 | 55.1 | 37 | 16 | 20 | 5 | 18 | 2 | 4 | 0 | 217 | 0 | 7.16 | 2.93 | 2.44 | 0.81 | 20.3 | 8.3 | 0.99 | .216 | 3.25 | 60 | 3.76 | 87 | 6.02 | 3.5 | |
| 5 | | A. Bailey | 6 | 2009 | 3 | .667 | 68 | 0 | 1.84 | 91 | 0 | 0 | 26 | 83.1 | 49 | 17 | 17 | 5 | 24 | 0 | 54 | 3 | 323 | 6 | 9.83 | 2.59 | 3.79 | 0.54 | 28.2 | 7.4 | 0.88 | .217 | 1.84 | 43 | 2.55 | 59 | 5.29 | 16.7 | |
| 6 | | G. Gonzalez | 6 | 2009 | 7 | .462 | 20 | 17 | 5.75 | 109 | 0 | 0 | 0 | 98.2 | 113 | 63 | 68 | 14 | 56 | 1 | 0 | 2 | 455 | 2 | 9.94 | 5.11 | 1.95 | 1.28 | 24.0 | 12.3 | 1.71 | .360 | 6.20 | 133 | 4.46 | 103 | 10.31 | -1.6 | |
| 7 | | M. Wuertz | 6 | 2009 | 1 | .857 | 74 | 0 | 2.63 | 102 | 0 | 0 | 4 | 78.2 | 52 | 23 | 25 | 6 | 23 | 0 | 9 | 1 | 304 | 6 | 11.67 | 2.63 | 4.43 | 0.69 | 33.6 | 7.6 | 0.95 | .266 | 2.86 | 61 | 2.36 | 55 | 5.95 | 17.4 | |
| 8 | | V. Mazzaro | 4 | 2009 | 9 | .308 | 17 | 17 | 5.32 | 59 | 0 | 0 | 0 | 91.1 | 120 | 54 | 61 | 12 | 39 | 4 | 0 | 3 | 423 | 5 | 5.81 | 3.84 | 1.51 | 1.18 | 13.9 | 9.2 | 1.74 | .350 | 6.01 | 123 | 4.92 | 114 | 11.82 | -6.2 | |
| 9 | | J. Outman | 4 | 2009 | 1 | .800 | 14 | 12 | 3.48 | 53 | 0 | 0 | 0 | 67.1 | 53 | 26 | 30 | 9 | 25 | 0 | 1 | 0 | 276 | 1 | 7.08 | 3.34 | 2.12 | 1.20 | 19.2 | 9.1 | 1.16 | .233 | 4.01 | 80 | 4.36 | 101 | 7.08 | -0.4 | |
| 10 | | B. Tomko | 4 | 2009 | 1 | .800 | 6 | 6 | 2.95 | 22 | 1 | 1 | 0 | 36.2 | 31 | 12 | 12 | 7 | 6 | 1 | 0 | 0 | 142 | 1 | 5.40 | 1.47 | 3.67 | 1.72 | 15.5 | 4.2 | 1.01 | .226 | 2.95 | 68 | 4.94 | 114 | 7.61 | -2.6 | |
| 11 | | D. Eveland | 2 | 2009 | 4 | .333 | 13 | 9 | 7.16 | 22 | 0 | 0 | 0 | 44.0 | 70 | 35 | 39 | 4 | 26 | 0 | 2 | 1 | 221 | 2 | 4.50 | 5.32 | 0.85 | 0.82 | 10.0 | 11.8 | 2.18 | .391 | 7.98 | 166 | 5.04 | 117 | 14.32 | -3.6 | |
| 12 | | C. Mortensen | 2 | 2009 | 4 | .333 | 6 | 6 | 7.81 | 11 | 0 | 0 | 0 | 27.2 | 37 | 24 | 28 | 5 | 12 | 2 | 0 | 0 | 133 | 1 | 3.58 | 3.90 | 0.92 | 1.63 | 8.3 | 9.0 | 1.77 | .311 | 9.11 | 181 | 6.16 | 143 | 12.04 | -5.8 | |
| 13 | | B. Ziegler | 2 | 2009 | 4 | .333 | 69 | 0 | 3.07 | 54 | 0 | 0 | 7 | 73.1 | 82 | 25 | 27 | 2 | 28 | 1 | 23 | 4 | 313 | 0 | 6.63 | 3.44 | 1.93 | 0.25 | 17.3 | 8.9 | 1.50 | .351 | 3.31 | 71 | 3.16 | 73 | 10.06 | 9.6 | |
| 14 | | S. Casilla | 1 | 2009 | 2 | .333 | 46 | 0 | 5.96 | 35 | 0 | 0 | 0 | 48.1 | 61 | 32 | 36 | 6 | 25 | 3 | 15 | 3 | 233 | 5 | 6.52 | 4.66 | 1.40 | 1.12 | 15.0 | 10.7 | 1.78 | .335 | 6.70 | 138 | 4.99 | 116 | 11.36 | -3.7 | |
| 15 | | S. Gallagher | 1 | 2009 | 2 | .333 | 6 | 2 | 8.16 | 10 | 0 | 0 | 0 | 14.1 | 21 | 13 | 16 | 1 | 7 | 2 | 3 | 0 | 71 | 1 | 6.28 | 4.40 | 1.43 | 0.63 | 14.1 | 9.9 | 1.95 | .392 | 10.05 | 189 | 4.48 | 104 | 13.19 | -0.3 | |
| 16 | | B. Kilby | 1 | 2009 | 0 | 1.000 | 11 | 1 | 0.53 | 20 | 0 | 0 | 0 | 17.0 | 10 | 1 | 2 | 1 | 4 | 0 | 1 | 0 | 65 | 0 | 10.59 | 2.12 | 5.00 | 0.53 | 30.8 | 6.2 | 0.82 | .225 | 1.06 | 12 | 2.20 | 51 | 5.29 | 4.1 |
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 Phillies - w | 88 | 74 | .543 | 6.0 |
80 | 82 | .494 | 14.0 | |
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| NL Central | W | L | PCT | GB |
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82 | 80 | .506 | 21.0 | |
77 | 85 | .475 | 26.0 | |
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| NL West | W | L | PCT | GB |
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| AL Central | W | L | PCT | GB |
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