Since 1920, Zack Britton has the lowest ERA by a relief pitcher with 40.0+ innings pitched in a season, with an ERA of 0.54 in 2016.
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| NAME | ERA | IP | SEASON | TM | 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 | H/9 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | Z. Britton | 0.54 | 67.0 | 2016 | 69 | 2 | 1 | .667 | 0 | 74 | 0 | 0 | 47 | 38 | 4 | 7 | 1 | 18 | 0 | 63 | 3 | 254 | 10 | 9.94 | 2.42 | 4.11 | 0.13 | 29.1 | 7.1 | 0.84 | .230 | 0.94 | 5.10 | |
| 2 | | J. Devine | 0.59 | 45.2 | 2008 | 42 | 6 | 1 | .857 | 0 | 49 | 0 | 0 | 1 | 23 | 3 | 7 | 0 | 15 | 0 | 10 | 2 | 170 | 0 | 9.66 | 2.96 | 3.27 | 0.00 | 28.8 | 8.8 | 0.83 | .217 | 1.38 | 4.53 | |
| 3 | | F. Rodney | 0.60 | 74.2 | 2012 | 76 | 2 | 2 | .500 | 0 | 76 | 0 | 0 | 48 | 43 | 5 | 9 | 2 | 15 | 3 | 65 | 1 | 282 | 4 | 9.16 | 1.81 | 5.07 | 0.24 | 27.0 | 5.3 | 0.78 | .220 | 1.08 | 5.18 | |
| 4 |  | E. Clase | 0.61 | 74.1 | 2024 | 74 | 4 | 2 | .667 | 0 | 66 | 0 | 0 | 47 | 39 | 5 | 10 | 2 | 10 | 2 | 66 | 1 | 270 | 2 | 7.99 | 1.21 | 6.60 | 0.24 | 24.4 | 3.7 | 0.66 | .195 | 1.21 | 4.72 | |
| 5 | | D. Eckersley | 0.61 | 73.1 | 1990 | 63 | 4 | 2 | .667 | 0 | 73 | 0 | 0 | 48 | 41 | 5 | 9 | 2 | 4 | 0 | 61 | 1 | 262 | 0 | 8.96 | 0.49 | 18.25 | 0.25 | 27.9 | 1.5 | 0.61 | .213 | 1.10 | 5.03 | |
| 6 | | A. Benton | 0.62 | 58.0 | 1949 | 29 | 4 | 0 | 1.000 | 0 | 14 | 0 | 0 | 10 | 37 | 4 | 5 | 1 | 21 | 0 | 18 | 222 | 0 | 2.17 | 3.26 | 0.67 | 0.16 | 6.3 | 9.5 | 1.00 | .194 | 0.78 | 5.74 | ||
| 7 | | R. Horton | 0.65 | 41.2 | 1986 | 33 | 1 | 0 | 1.000 | 0 | 18 | 0 | 0 | 3 | 24 | 3 | 3 | 2 | 11 | 1 | 12 | 3 | 154 | 0 | 3.89 | 2.38 | 1.64 | 0.43 | 11.7 | 7.1 | 0.84 | .180 | 0.65 | 5.18 | |
| 8 | | C. Sadler | 0.67 | 40.1 | 2021 | 42 | 0 | 1 | .000 | 0 | 37 | 0 | 0 | 0 | 19 | 3 | 4 | 1 | 10 | 1 | 2 | 0 | 145 | 2 | 8.26 | 2.23 | 3.70 | 0.22 | 25.5 | 6.9 | 0.72 | .188 | 0.89 | 4.24 | |
| 9 | | R. Murphy | 0.72 | 50.1 | 1986 | 34 | 6 | 0 | 1.000 | 0 | 36 | 0 | 0 | 1 | 26 | 4 | 4 | 0 | 21 | 0 | 12 | 2 | 195 | 5 | 6.44 | 3.75 | 1.71 | 0.00 | 18.5 | 10.8 | 0.93 | .188 | 0.72 | 4.65 | |
| 10 | | R. Gossage | 0.77 | 46.2 | 1981 | 32 | 3 | 2 | .600 | 0 | 48 | 0 | 0 | 20 | 22 | 4 | 6 | 2 | 14 | 1 | 30 | 1 | 173 | 1 | 9.26 | 2.70 | 3.43 | 0.39 | 27.7 | 8.1 | 0.77 | .185 | 1.16 | 4.24 | |
| 11 |  | B. Treinen | 0.78 | 80.1 | 2018 | 68 | 9 | 2 | .818 | 0 | 100 | 0 | 0 | 38 | 46 | 7 | 12 | 2 | 21 | 1 | 58 | 3 | 315 | 6 | 11.20 | 2.35 | 4.76 | 0.22 | 31.7 | 6.7 | 0.83 | .230 | 1.34 | 5.15 | |
| 12 | | T. Acker | 0.81 | 44.2 | 1956 | 22 | 1 | 2 | .333 | 0 | 34 | 0 | 0 | 1 | 24 | 4 | 5 | 2 | 18 | 2 | 3 | 1 | 176 | 0 | 6.85 | 3.63 | 1.89 | 0.40 | 19.3 | 10.2 | 0.94 | .183 | 1.01 | 4.84 | |
| 13 | | S. Miller | 0.81 | 44.1 | 1958 | 21 | 0 | 2 | .000 | 0 | 33 | 0 | 0 | 0 | 33 | 4 | 5 | 1 | 11 | 0 | 7 | 0 | 173 | 0 | 6.70 | 2.23 | 3.00 | 0.20 | 19.1 | 6.4 | 0.99 | .250 | 1.02 | 6.70 | |
| 14 | | L. Grove | 0.81 | 44.1 | 1933 | 17 | 6 | 2 | .750 | 0 | 17 | 0 | 0 | 6 | 31 | 4 | 5 | 0 | 14 | 0 | 16 | 176 | 1 | 3.45 | 2.84 | 1.21 | 0.00 | 9.7 | 8.0 | 1.02 | .214 | 1.02 | 6.29 | ||
| 15 | | N. Charlton | 0.84 | 42.2 | 1991 | 28 | 0 | 0 | 0 | 40 | 0 | 0 | 1 | 27 | 4 | 5 | 1 | 12 | 2 | 10 | 3 | 162 | 4 | 8.44 | 2.53 | 3.33 | 0.21 | 24.7 | 7.4 | 0.91 | .243 | 1.05 | 5.70 | ||
| 16 | | S. Comer | 0.85 | 42.1 | 1978 | 19 | 5 | 2 | .714 | 0 | 24 | 0 | 0 | 1 | 38 | 4 | 6 | 0 | 13 | 0 | 14 | 2 | 170 | 1 | 5.10 | 2.76 | 1.85 | 0.00 | 14.1 | 7.6 | 1.20 | .286 | 1.28 | 8.08 | |
| 17 | | B. Henry | 0.87 | 52.0 | 1964 | 37 | 2 | 2 | .500 | 0 | 29 | 0 | 0 | 6 | 31 | 5 | 9 | 2 | 12 | 3 | 20 | 4 | 202 | 1 | 5.02 | 2.08 | 2.42 | 0.35 | 14.4 | 5.9 | 0.83 | .186 | 1.56 | 5.37 | |
| 18 | | D. Reyes | 0.89 | 50.2 | 2006 | 66 | 5 | 0 | 1.000 | 0 | 49 | 0 | 0 | 0 | 35 | 5 | 8 | 3 | 15 | 0 | 8 | 2 | 194 | 4 | 8.70 | 2.66 | 3.27 | 0.53 | 25.3 | 7.7 | 0.99 | .252 | 1.42 | 6.22 | |
| 19 | | V. Kennedy | 0.89 | 40.1 | 1943 | 11 | 3 | 1 | .750 | 0 | 16 | 0 | 0 | 0 | 28 | 4 | 4 | 0 | 10 | 1 | 9 | 149 | 0 | 3.57 | 2.23 | 1.60 | 0.00 | 10.7 | 6.7 | 0.94 | .230 | 0.89 | 6.25 | ||
| 20 | | J. Thompson | 0.92 | 58.2 | 1946 | 38 | 4 | 5 | .444 | 0 | 29 | 0 | 0 | 4 | 33 | 6 | 16 | 4 | 39 | 0 | 27 | 238 | 2 | 4.45 | 5.98 | 0.74 | 0.61 | 12.2 | 16.4 | 1.23 | .175 | 2.45 | 5.06 | ||
| 21 | | J. Papelbon | 0.92 | 68.1 | 2006 | 59 | 4 | 2 | .667 | 0 | 75 | 0 | 0 | 35 | 40 | 7 | 8 | 3 | 13 | 1 | 49 | 2 | 257 | 2 | 9.88 | 1.71 | 5.77 | 0.40 | 29.2 | 5.1 | 0.78 | .224 | 1.05 | 5.27 | |
| 22 |  | W. Davis | 0.94 | 67.1 | 2015 | 69 | 8 | 1 | .889 | 0 | 78 | 0 | 0 | 17 | 33 | 7 | 8 | 3 | 20 | 0 | 24 | 1 | 251 | 1 | 10.43 | 2.67 | 3.90 | 0.40 | 31.1 | 8.0 | 0.79 | .200 | 1.07 | 4.41 | |
| 23 | | C. Hammond | 0.95 | 76.0 | 2002 | 63 | 7 | 2 | .778 | 0 | 63 | 0 | 0 | 0 | 53 | 8 | 15 | 1 | 31 | 1 | 6 | 9 | 311 | 1 | 7.46 | 3.67 | 2.03 | 0.12 | 20.3 | 10.0 | 1.11 | .242 | 1.78 | 6.28 | |
| 24 | | E. O'Flaherty | 0.98 | 73.2 | 2011 | 78 | 2 | 4 | .333 | 0 | 67 | 0 | 0 | 0 | 59 | 8 | 9 | 2 | 21 | 3 | 5 | 8 | 301 | 1 | 8.19 | 2.57 | 3.19 | 0.24 | 22.3 | 7.0 | 1.09 | .274 | 1.10 | 7.21 | |
| 25 | | W. Davis | 1.00 | 72.0 | 2014 | 71 | 9 | 2 | .818 | 0 | 109 | 0 | 0 | 3 | 38 | 8 | 8 | 0 | 23 | 3 | 11 | 0 | 279 | 1 | 13.63 | 2.88 | 4.74 | 0.00 | 39.1 | 8.2 | 0.85 | .264 | 1.00 | 4.75 | |
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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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Mets
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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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