Jason Hammel had his best career win percentage for the Cubs when starting 4+ games 2 times, at 1.000.
| OPP | W% | GS | W | L | G | 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 | H/9 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Reds | 1.000 | 7 | 4 | 0 | 7 | 2.08 | 33 | 0 | 0 | 0 | 39.0 | 35 | 9 | 12 | 3 | 13 | 1 | 0 | 1 | 165 | 2 | 7.62 | 3.00 | 2.54 | 0.69 | 20.0 | 7.9 | 1.23 | .278 | 2.77 | 8.08 |
| 2 |  Nationals | 1.000 | 5 | 3 | 0 | 5 | 2.78 | 27 | 0 | 0 | 0 | 32.1 | 24 | 10 | 10 | 4 | 9 | 0 | 0 | 0 | 126 | 4 | 7.52 | 2.51 | 3.00 | 1.11 | 21.4 | 7.1 | 1.02 | .233 | 2.78 | 6.68 |
| 3 |  Brewers | .778 | 11 | 7 | 2 | 11 | 3.22 | 65 | 0 | 0 | 0 | 67.0 | 56 | 24 | 26 | 10 | 19 | 3 | 0 | 0 | 270 | 3 | 8.73 | 2.55 | 3.42 | 1.34 | 24.1 | 7.0 | 1.12 | .266 | 3.49 | 7.52 |
| 4 |  Diamondbacks | .667 | 4 | 2 | 1 | 4 | 2.67 | 25 | 0 | 0 | 0 | 27.0 | 14 | 8 | 8 | 3 | 6 | 0 | 0 | 1 | 98 | 1 | 8.33 | 2.00 | 4.17 | 1.00 | 25.5 | 6.1 | 0.74 | .172 | 2.67 | 4.67 |
| 5 |  Pirates | .600 | 11 | 6 | 4 | 11 | 3.38 | 59 | 0 | 0 | 0 | 64.0 | 60 | 24 | 26 | 8 | 14 | 4 | 0 | 2 | 267 | 1 | 8.30 | 1.97 | 4.21 | 1.13 | 22.1 | 5.2 | 1.16 | .286 | 3.66 | 8.44 |
| 6 |  Marlins | .500 | 6 | 2 | 2 | 6 | 2.09 | 39 | 0 | 0 | 0 | 38.2 | 31 | 9 | 9 | 3 | 7 | 2 | 0 | 1 | 155 | 2 | 9.08 | 1.63 | 5.57 | 0.70 | 25.2 | 4.5 | 0.98 | .269 | 2.09 | 7.22 |
| 7 |  Braves | .500 | 4 | 1 | 1 | 4 | 3.38 | 23 | 0 | 0 | 0 | 24.0 | 24 | 9 | 9 | 4 | 3 | 2 | 0 | 0 | 102 | 1 | 8.63 | 1.13 | 7.67 | 1.50 | 22.5 | 2.9 | 1.13 | .286 | 3.38 | 9.00 |
| 8 |  Cardinals | .375 | 10 | 3 | 5 | 10 | 5.66 | 49 | 0 | 0 | 0 | 49.1 | 49 | 31 | 31 | 6 | 16 | 4 | 0 | 1 | 208 | 2 | 8.94 | 2.92 | 3.06 | 1.09 | 23.6 | 7.7 | 1.32 | .323 | 5.66 | 8.94 |
StatMuse has game-level data for pitcher win percentage and starts going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
Brewers 
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