Buck O'Brien has the lowest ERA for the Red Sox in a season, with an ERA of 0.38 in his rookie season in 1911.
| NAME | ERA | SEASON | TM | G | W | L | W% | GS | 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. O'Brien | 0.38 | 1911 | 6 | 5 | 1 | .833 | 5 | 31 | 5 | 2 | 0 | 47.2 | 30 | 2 | 9 | 0 | 21 | 1 | 1 | 189 | 0 | 5.85 | 3.97 | 1.48 | 0.00 | 16.4 | 11.1 | 1.07 | .221 | 1.70 | 11 | 2.85 | 88 | 5.66 | 2 | ||
| 2 | | A. Maddox | 0.52 | 2017 | 13 | 0 | 0 | 0 | 14 | 0 | 0 | 0 | 17.1 | 13 | 1 | 1 | 1 | 2 | 0 | 5 | 0 | 67 | 0 | 7.27 | 1.04 | 7.00 | 0.52 | 20.9 | 3.0 | 0.87 | .240 | 0.52 | 11 | 2.63 | 61 | 6.75 | 3.3 | ||
| 3 | | T. Houck | 0.53 | 2020 | 3 | 3 | 0 | 1.000 | 3 | 21 | 0 | 0 | 0 | 17.0 | 6 | 1 | 2 | 1 | 9 | 1 | 0 | 0 | 63 | 1 | 11.12 | 4.76 | 2.33 | 0.53 | 33.3 | 14.3 | 0.88 | .161 | 1.06 | 11 | 3.24 | 73 | 3.18 | 2.3 | |
| 4 | | L. Aponte | 0.57 | 1981 | 7 | 1 | 0 | 1.000 | 0 | 11 | 0 | 0 | 1 | 15.2 | 11 | 1 | 1 | 0 | 3 | 0 | 3 | 0 | 57 | 0 | 6.32 | 1.72 | 3.67 | 0.00 | 19.3 | 5.3 | 0.89 | .256 | 0.57 | 15 | 1.77 | 47 | 6.32 | 3.4 | |
| 5 | | J. Pena | 0.69 | 1999 | 2 | 2 | 0 | 1.000 | 2 | 15 | 0 | 0 | 0 | 13.0 | 9 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 49 | 0 | 10.38 | 2.08 | 5.00 | 0.00 | 30.6 | 6.1 | 0.92 | .290 | 0.69 | 14 | 1.51 | 32 | 6.23 | 4.7 | |
| 6 | | W. Rich | 0.77 | 1940 | 3 | 1 | 0 | 1.000 | 1 | 8 | 1 | 0 | 0 | 11.2 | 9 | 1 | 3 | 2 | 1 | 0 | 1 | 44 | 0 | 6.17 | 0.77 | 8.00 | 1.54 | 18.2 | 2.3 | 0.86 | .212 | 2.31 | 17 | 3.95 | 89 | 6.94 | 0.6 | ||
| 7 | | W. Banks | 0.84 | 2001 | 5 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10.2 | 5 | 1 | 4 | 0 | 4 | 0 | 1 | 0 | 42 | 1 | 8.44 | 3.38 | 2.50 | 0.00 | 23.8 | 9.5 | 0.84 | .179 | 3.38 | 18 | 2.29 | 53 | 4.22 | 2.4 | ||
| 8 | | J. Papelbon | 0.92 | 2006 | 59 | 4 | 2 | .667 | 0 | 75 | 0 | 0 | 35 | 68.1 | 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 | 20 | 2.13 | 48 | 5.27 | 17.7 | |
| 9 | | T. Layne | 0.95 | 2014 | 30 | 2 | 1 | .667 | 0 | 14 | 0 | 0 | 0 | 19.0 | 14 | 2 | 4 | 0 | 8 | 1 | 3 | 1 | 76 | 2 | 6.63 | 3.79 | 1.75 | 0.00 | 18.4 | 10.5 | 1.16 | .264 | 1.89 | 24 | 3.08 | 82 | 6.63 | 1.4 | |
| 10 | | D. Leonard | 0.96 | 1914 | 36 | 19 | 5 | .792 | 25 | 176 | 17 | 7 | 3 | 224.2 | 139 | 24 | 34 | 3 | 60 | 8 | 8 | 842 | 2 | 7.05 | 2.40 | 2.93 | 0.12 | 20.9 | 7.1 | 0.89 | .229 | 1.36 | 36 | 1.95 | 70 | 5.57 | 20.4 | ||
| 11 | | C. Martin | 1.05 | 2023 | 55 | 4 | 1 | .800 | 0 | 46 | 0 | 0 | 3 | 51.1 | 45 | 6 | 6 | 2 | 8 | 0 | 12 | 3 | 199 | 1 | 8.06 | 1.40 | 5.75 | 0.35 | 23.1 | 4.0 | 1.03 | .301 | 1.05 | 23 | 2.43 | 56 | 7.89 | 10.7 | |
| 12 | | K. Uehara | 1.09 | 2013 | 73 | 4 | 1 | .800 | 0 | 101 | 0 | 0 | 21 | 74.1 | 33 | 9 | 10 | 5 | 9 | 1 | 40 | 2 | 265 | 1 | 12.23 | 1.09 | 11.22 | 0.61 | 38.1 | 3.4 | 0.57 | .188 | 1.21 | 26 | 1.60 | 41 | 4.00 | 19.1 | |
| 13 | | F. Anderson | 1.13 | 1909 | 1 | 0 | 0 | 1 | 5 | 0 | 0 | 0 | 8.0 | 3 | 1 | 3 | 0 | 1 | 0 | 0 | 27 | 0 | 5.63 | 1.13 | 5.00 | 0.00 | 18.5 | 3.7 | 0.50 | .143 | 3.38 | 45 | 1.34 | 55 | 3.38 | 1 | |||
| 14 | | W. Olds | 1.15 | 2026 | 14 | 2 | 0 | 1.000 | 0 | 20 | 0 | 0 | 0 | 15.2 | 11 | 2 | 5 | 2 | 8 | 2 | 6 | 0 | 68 | 2 | 11.49 | 4.60 | 2.50 | 1.15 | 29.4 | 11.8 | 1.21 | .250 | 2.87 | 27 | 4.12 | 99 | 6.32 | 0 | |
| 15 |  | A. Chapman | 1.17 | 2025 | 67 | 5 | 3 | .625 | 0 | 85 | 0 | 0 | 32 | 61.1 | 28 | 8 | 9 | 3 | 15 | 0 | 43 | 0 | 228 | 6 | 12.47 | 2.20 | 5.67 | 0.44 | 37.3 | 6.6 | 0.70 | .200 | 1.32 | 28 | 1.73 | 41 | 4.11 | 16.7 | |
| 16 | | N. Chittum | 1.19 | 1959 | 21 | 3 | 0 | 1.000 | 0 | 12 | 0 | 0 | 0 | 30.1 | 29 | 4 | 9 | 0 | 11 | 0 | 13 | 2 | 124 | 0 | 3.56 | 3.26 | 1.09 | 0.00 | 9.7 | 8.9 | 1.32 | .287 | 2.67 | 29 | 2.84 | 69 | 8.60 | 4.2 | |
| 17 | | L. Andersen | 1.23 | 1990 | 15 | 0 | 0 | 0 | 25 | 0 | 0 | 1 | 22.0 | 18 | 3 | 3 | 0 | 3 | 1 | 4 | 0 | 86 | 2 | 10.23 | 1.23 | 8.33 | 0.00 | 29.1 | 3.5 | 0.95 | .316 | 1.23 | 30 | 1.07 | 27 | 7.36 | 7 | ||
| 18 | | S. Williamson | 1.26 | 2004 | 28 | 0 | 1 | .000 | 0 | 28 | 0 | 0 | 1 | 28.2 | 11 | 4 | 6 | 0 | 18 | 3 | 5 | 1 | 120 | 4 | 8.79 | 5.65 | 1.56 | 0.00 | 23.3 | 15.0 | 1.01 | .155 | 1.88 | 27 | 3.28 | 75 | 3.45 | 3.6 | |
| 19 |  | C. Young | 1.26 | 1908 | 36 | 21 | 11 | .656 | 33 | 150 | 30 | 3 | 2 | 299.0 | 230 | 42 | 68 | 1 | 37 | 1 | 3 | 1,116 | 4 | 4.52 | 1.11 | 4.05 | 0.03 | 13.4 | 3.3 | 0.89 | .247 | 2.05 | 52 | 1.52 | 67 | 6.92 | 25.4 | ||
| 20 | | L. Aponte | 1.29 | 1980 | 4 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 7.0 | 6 | 1 | 1 | 0 | 2 | 0 | 3 | 1 | 28 | 0 | 1.29 | 2.57 | 0.50 | 0.00 | 3.6 | 7.1 | 1.14 | .240 | 1.29 | 30 | 3.32 | 81 | 7.71 | 0.6 | ||
| 21 | | L. Swormstedt | 1.29 | 1906 | 3 | 1 | 1 | .500 | 2 | 6 | 2 | 0 | 0 | 21.0 | 17 | 3 | 6 | 0 | 0 | 1 | 1 | 77 | 0 | 2.57 | 0.00 | 0.00 | 7.8 | 0.0 | 0.81 | .243 | 2.57 | 48 | 1.94 | 75 | 7.29 | 1.5 | |||
| 22 | | C. Smith | 1.35 | 2017 | 8 | 0 | 0 | 0 | 7 | 0 | 0 | 1 | 6.2 | 7 | 1 | 1 | 0 | 2 | 0 | 1 | 0 | 27 | 0 | 9.45 | 2.70 | 3.50 | 0.00 | 25.9 | 7.4 | 1.35 | .389 | 1.35 | 29 | 1.95 | 45 | 9.45 | 1.8 | ||
| 23 | | C. Schiraldi | 1.41 | 1986 | 25 | 4 | 2 | .667 | 0 | 55 | 0 | 0 | 9 | 51.0 | 36 | 8 | 8 | 5 | 15 | 1 | 21 | 2 | 198 | 1 | 9.71 | 2.65 | 3.67 | 0.88 | 27.8 | 7.6 | 1.00 | .254 | 1.41 | 33 | 2.82 | 69 | 6.35 | 7.2 | |
| 24 | | H. Taylor | 1.42 | 1950 | 3 | 2 | 0 | 1.000 | 2 | 8 | 2 | 1 | 0 | 19.0 | 13 | 3 | 3 | 0 | 8 | 0 | 1 | 74 | 1 | 3.79 | 3.79 | 1.00 | 0.00 | 10.8 | 10.8 | 1.11 | .224 | 1.42 | 29 | 3.01 | 64 | 6.16 | 3.5 | ||
| 25 | | J. Tazawa | 1.43 | 2012 | 37 | 1 | 1 | .500 | 0 | 45 | 0 | 0 | 1 | 44.0 | 37 | 7 | 7 | 1 | 5 | 2 | 13 | 0 | 172 | 0 | 9.20 | 1.02 | 9.00 | 0.20 | 26.2 | 2.9 | 0.95 | .303 | 1.43 | 34 | 1.81 | 45 | 7.57 | 11.1 | |
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More Red Sox Stats
Team Batting Leaders 
AVG
.333
Abreu
Team Pitching Leaders 
K
4
Tolle
ERA
0.00
Weissert
Team Rankings
HR
163
26th
R
689
23rd
SO
1,398
11th
ERA
3.54
3rd
Orioles
Blue Jays
MLB 2026 Batting Leaders
MLB 2026 Pitching Leaders
MLB Fantasy 2026
MLB 2026 Betting
MLB 2026 Standings
| 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 |
Marlins
Nationals
Mets
Pirates
Cardinals
Reds
Diamondbacks
Giants
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 |
Twins
Tigers
Royals
Rangers
Mariners
Athletics
Angels