50 pitchers are tied for the best career win percentage by a relief pitcher, at 1.000. The first three are Hunter Barco, Mitchell Parker and Aaron Civale.
| NAME | W% | W | L | 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 | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | H. Barco | 1.000 | 1 | 0 | 2 | 0 | 0.00 | 3 | 0 | 0 | 0 | 3.0 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | 0 | 9.00 | 0.00 | 0.00 | 25.0 | 0.0 | 1.00 | .333 | 0.00 | 9.00 | |
| 2 | | M. Parker | 1.000 | 1 | 0 | 3 | 0 | 1.42 | 2 | 0 | 0 | 1 | 6.1 | 3 | 1 | 1 | 0 | 1 | 0 | 2 | 0 | 23 | 1 | 2.84 | 1.42 | 2.00 | 0.00 | 8.7 | 4.3 | 0.63 | .150 | 1.42 | 4.26 |
| 3 | | A. Civale | 1.000 | 1 | 0 | 5 | 0 | 2.08 | 14 | 0 | 0 | 1 | 13.0 | 7 | 3 | 3 | 3 | 0 | 3 | 2 | 0 | 50 | 0 | 9.69 | 0.00 | 2.08 | 28.0 | 0.0 | 0.54 | .133 | 2.08 | 4.85 | |
| 4 | | E. Hancock | 1.000 | 1 | 0 | 6 | 0 | 2.08 | 4 | 0 | 0 | 0 | 8.2 | 10 | 2 | 4 | 0 | 1 | 0 | 2 | 0 | 36 | 0 | 4.15 | 1.04 | 4.00 | 0.00 | 11.1 | 2.8 | 1.27 | .323 | 4.15 | 10.38 |
| 5 | | R. Fitts | 1.000 | 1 | 0 | 1 | 0 | 6.75 | 6 | 0 | 0 | 0 | 4.0 | 2 | 3 | 3 | 1 | 3 | 1 | 0 | 0 | 18 | 0 | 13.50 | 6.75 | 2.00 | 2.25 | 33.3 | 16.7 | 1.25 | .143 | 6.75 | 4.50 |
| 6 | | B. Van Belle | 1.000 | 1 | 0 | 4 | 0 | 5.40 | 6 | 0 | 0 | 0 | 8.1 | 13 | 5 | 5 | 2 | 0 | 0 | 2 | 0 | 36 | 1 | 6.48 | 0.00 | 2.16 | 16.7 | 0.0 | 1.56 | .393 | 5.40 | 14.04 | |
| 7 | | B. Chandler | 1.000 | 2 | 0 | 3 | 0 | 2.25 | 9 | 0 | 0 | 1 | 12.0 | 9 | 3 | 3 | 2 | 1 | 2 | 1 | 0 | 47 | 0 | 6.75 | 0.75 | 9.00 | 1.50 | 19.1 | 2.1 | 0.83 | .212 | 2.25 | 6.75 |
| 8 | | AJ Blubaugh | 1.000 | 3 | 0 | 8 | 0 | 1.71 | 20 | 0 | 0 | 0 | 21.0 | 9 | 4 | 4 | 4 | 5 | 0 | 2 | 0 | 77 | 0 | 8.57 | 2.14 | 4.00 | 1.71 | 26.0 | 6.5 | 0.67 | .104 | 1.71 | 3.86 |
| 9 | | H. Waldrep | 1.000 | 1 | 0 | 1 | 0 | 1.59 | 4 | 0 | 0 | 0 | 5.2 | 3 | 1 | 1 | 0 | 2 | 0 | 0 | 0 | 22 | 0 | 6.35 | 3.18 | 2.00 | 0.00 | 18.2 | 9.1 | 0.88 | .188 | 1.59 | 4.76 |
| 10 | | S. Ogasawara | 1.000 | 1 | 0 | 21 | 0 | 6.47 | 26 | 0 | 0 | 0 | 32.0 | 32 | 23 | 23 | 8 | 16 | 1 | 7 | 0 | 141 | 1 | 7.31 | 4.50 | 1.63 | 2.25 | 18.4 | 11.3 | 1.50 | .267 | 6.47 | 9.00 |
| 11 | | D. Darnell | 1.000 | 1 | 0 | 9 | 0 | 3.86 | 5 | 0 | 0 | 0 | 11.2 | 10 | 5 | 5 | 1 | 7 | 0 | 4 | 0 | 48 | 0 | 3.86 | 5.40 | 0.71 | 0.77 | 10.4 | 14.6 | 1.46 | .257 | 3.86 | 7.71 |
| 12 | | C. Gordon | 1.000 | 2 | 0 | 6 | 0 | 5.06 | 11 | 0 | 0 | 1 | 16.0 | 14 | 9 | 10 | 4 | 6 | 0 | 2 | 0 | 68 | 0 | 6.19 | 3.38 | 1.83 | 2.25 | 16.2 | 8.8 | 1.25 | .213 | 5.63 | 7.88 |
| 13 | | E. Núñez | 1.000 | 1 | 0 | 10 | 0 | 7.11 | 11 | 0 | 0 | 0 | 12.2 | 13 | 10 | 10 | 2 | 11 | 3 | 3 | 0 | 60 | 2 | 7.82 | 7.82 | 1.00 | 1.42 | 18.3 | 18.3 | 1.89 | .333 | 7.11 | 9.24 |
| 14 | | B. Tidwell | 1.000 | 1 | 0 | 2 | 0 | 8.22 | 4 | 0 | 0 | 0 | 7.2 | 10 | 7 | 7 | 3 | 4 | 0 | 1 | 0 | 38 | 0 | 4.70 | 4.70 | 1.00 | 3.52 | 10.5 | 10.5 | 1.83 | .259 | 8.22 | 11.74 |
| 15 | | C. Phillips | 1.000 | 5 | 0 | 21 | 0 | 2.88 | 32 | 0 | 0 | 0 | 25.0 | 11 | 8 | 9 | 3 | 12 | 2 | 5 | 0 | 98 | 2 | 11.52 | 4.32 | 2.67 | 1.08 | 32.7 | 12.2 | 0.92 | .163 | 3.24 | 3.96 |
| 16 | | W. González | 1.000 | 1 | 0 | 16 | 0 | 2.66 | 25 | 0 | 0 | 0 | 20.1 | 13 | 6 | 9 | 1 | 12 | 0 | 6 | 0 | 87 | 0 | 11.07 | 5.31 | 2.08 | 0.44 | 28.7 | 13.8 | 1.23 | .245 | 3.98 | 5.75 |
| 17 | | C. Povich | 1.000 | 1 | 0 | 2 | 0 | 3.12 | 14 | 0 | 0 | 0 | 8.2 | 8 | 3 | 3 | 0 | 4 | 0 | 0 | 0 | 37 | 2 | 14.54 | 4.15 | 3.50 | 0.00 | 37.8 | 10.8 | 1.38 | .421 | 3.12 | 8.31 |
| 18 | | A. Granillo | 1.000 | 1 | 0 | 14 | 0 | 4.71 | 18 | 0 | 0 | 1 | 21.0 | 22 | 11 | 11 | 3 | 7 | 1 | 6 | 0 | 91 | 2 | 7.71 | 3.00 | 2.57 | 1.29 | 19.8 | 7.7 | 1.38 | .306 | 4.71 | 9.43 |
| 19 | | D. Smith | 1.000 | 1 | 0 | 7 | 0 | 1.38 | 4 | 0 | 0 | 0 | 13.0 | 6 | 2 | 2 | 0 | 5 | 3 | 5 | 0 | 48 | 0 | 2.77 | 3.46 | 0.80 | 0.00 | 8.3 | 10.4 | 0.85 | .167 | 1.38 | 4.15 |
| 20 | | L. Allen | 1.000 | 1 | 0 | 1 | 0 | 0.00 | 2 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 | 18.00 | 0.00 | 0.00 | 66.7 | 0.0 | 0.00 | .000 | 0.00 | 0.00 | |
| 21 | | B. Rodriguez | 1.000 | 1 | 0 | 7 | 0 | 1.17 | 9 | 0 | 0 | 0 | 7.2 | 4 | 1 | 1 | 0 | 3 | 3 | 3 | 1 | 31 | 0 | 10.57 | 3.52 | 3.00 | 0.00 | 29.0 | 9.7 | 0.91 | .250 | 1.17 | 4.70 |
| 22 | | C. Rodriguez | 1.000 | 1 | 0 | 4 | 0 | 6.52 | 11 | 0 | 0 | 0 | 9.2 | 13 | 7 | 7 | 1 | 9 | 0 | 3 | 0 | 50 | 1 | 10.24 | 8.38 | 1.22 | 0.93 | 22.0 | 18.0 | 2.28 | .414 | 6.52 | 12.10 |
| 23 | | R. Rolison | 1.000 | 1 | 0 | 30 | 0 | 7.19 | 24 | 0 | 0 | 0 | 41.1 | 54 | 33 | 35 | 11 | 20 | 0 | 10 | 0 | 189 | 1 | 5.23 | 4.35 | 1.20 | 2.40 | 12.7 | 10.6 | 1.79 | .321 | 7.62 | 11.76 |
| 24 | | B. Fisher | 1.000 | 7 | 0 | 51 | 0 | 1.85 | 61 | 0 | 0 | 0 | 48.2 | 28 | 10 | 10 | 2 | 18 | 3 | 12 | 1 | 193 | 0 | 11.28 | 3.33 | 3.39 | 0.37 | 31.6 | 9.3 | 0.95 | .239 | 1.85 | 5.18 |
| 25 | | C. Horton | 1.000 | 1 | 0 | 1 | 0 | 6.75 | 5 | 0 | 0 | 0 | 4.0 | 4 | 3 | 3 | 1 | 0 | 1 | 0 | 0 | 18 | 1 | 11.25 | 0.00 | 2.25 | 27.8 | 0.0 | 1.00 | .273 | 6.75 | 9.00 | |
StatMuse has game-level data for pitcher win percentage going back to the 1901 season.
Some of the information used here was obtained free of charge from Retrosheet.
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| NL East | W | L | PCT | GB |
|---|---|---|---|---|
 Phillies - y | 96 | 66 | .593 | |
83 | 79 | .512 | 13.0 | |
79 | 83 | .488 | 17.0 | |
76 | 86 | .469 | 20.0 | |
66 | 96 | .407 | 30.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 97 | 65 | .599 | |
 Cubs - w | 92 | 70 | .568 | 5.0 |
 Reds - w | 83 | 79 | .512 | 14.0 |
78 | 84 | .481 | 19.0 | |
71 | 91 | .438 | 26.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 93 | 69 | .574 | |
 Padres - w | 90 | 72 | .556 | 3.0 |
81 | 81 | .500 | 12.0 | |
80 | 82 | .494 | 13.0 | |
43 | 119 | .265 | 50.0 |
Marlins
Braves
Nationals
Giants
Diamondbacks
Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
 Blue Jays - y | 94 | 68 | .580 | |
 Yankees - w | 94 | 68 | .580 | |
 Red Sox - w | 89 | 73 | .549 | 5.0 |
77 | 85 | .475 | 17.0 | |
75 | 87 | .463 | 19.0 | |
| AL Central | W | L | PCT | GB |
 Guardians - y | 88 | 74 | .543 | |
 Tigers - w | 87 | 75 | .537 | 1.0 |
82 | 80 | .506 | 6.0 | |
70 | 92 | .432 | 18.0 | |
60 | 102 | .370 | 28.0 | |
| AL West | W | L | PCT | GB |
 Mariners - y | 90 | 72 | .556 | |
87 | 75 | .537 | 3.0 | |
81 | 81 | .500 | 9.0 | |
76 | 86 | .469 | 14.0 | |
72 | 90 | .444 | 18.0 |
Rays
Orioles
Royals
Twins
White Sox
Astros
Rangers
Athletics
Angels
