Walter Clarkson played 5 seasons for the Highlanders and Naps. He had 18 wins, 16 losses, an ERA of 3.17 and 178 strikeouts.
| 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 |  | W. Clarkson | 1904 |  NYH | 13 | 1 | 2 | .333 | 4 | 5.02 | 43 | 2 | 0 | 1 | 66.1 | 63 | 37 | 42 | 3 | 25 | 10 | 9 | 286 | 1 | 5.83 | 3.39 | 1.72 | 0.41 | 15.0 | 8.7 | 1.33 | .293 | 5.70 | 179 | 3.29 | 121 | 8.55 | -3.3 | |
| 2 | | W. Clarkson | 1905 | NYH | 9 | 3 | 3 | .500 | 4 | 3.91 | 35 | 3 | 0 | 0 | 46.0 | 40 | 20 | 26 | 1 | 13 | 2 | 4 | 185 | 3 | 6.85 | 2.54 | 2.69 | 0.20 | 18.9 | 7.0 | 1.15 | .291 | 5.09 | 137 | 2.26 | 77 | 7.83 | 3.6 | |
| 3 | | W. Clarkson | 1906 | NYH | 32 | 9 | 4 | .692 | 16 | 2.32 | 64 | 9 | 3 | 0 | 151.0 | 135 | 39 | 59 | 6 | 55 | 5 | 10 | 617 | 5 | 3.81 | 3.28 | 1.16 | 0.36 | 10.4 | 8.9 | 1.26 | .265 | 3.52 | 80 | 3.23 | 116 | 8.05 | -5.6 | |
| 4 |  | W. Clarkson | 1907 | TOT | 22 | 5 | 7 | .417 | 12 | 2.67 | 35 | 9 | 1 | 1 | 108.0 | 96 | 32 | 52 | 2 | 37 | 5 | 7 | 442 | 1 | 2.92 | 3.08 | 0.95 | 0.17 | 7.9 | 8.4 | 1.23 | .259 | 4.33 | 103 | 2.94 | 123 | 8.00 | -6.5 | |
| 5 |  | W. Clarkson | 1908 |  CLE | 2 | 0 | 0 | 1 | 10.80 | 1 | 0 | 0 | 0 | 3.1 | 6 | 4 | 4 | 0 | 2 | 2 | 1 | 19 | 0 | 2.70 | 5.40 | 0.50 | 0.00 | 5.3 | 10.5 | 2.40 | .429 | 10.80 | 457 | 5.10 | 230 | 16.20 | -1.1 | ||
| Total | 78 | 18 | 16 | .529 | 37 | 3.17 | 178 | 23 | 4 | 2 | 374.2 | 340 | 132 | 183 | 12 | 132 | 24 | 31 | 1,549 | 10 | 4.28 | 3.17 | 1.35 | 0.29 | 11.5 | 8.5 | 1.26 | .273 | 4.40 | 115 | 3.05 | 115 | 8.17 | -13 |
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