Edwin Díaz has fanned the most batters by a Mariners relief pitcher in a season, with 124 strikeouts in 2018.
| NAME | SO | SEASON | TM | G | W | L | W% | GS | ERA | 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 |  | E. Díaz | 124 | 2018 | 73 | 0 | 4 | .000 | 0 | 1.96 | 0 | 0 | 57 | 73.1 | 41 | 16 | 17 | 5 | 17 | 6 | 65 | 0 | 280 | 3 | 15.22 | 2.09 | 7.29 | 0.61 | 44.3 | 6.1 | 0.79 | .281 | 2.09 | 5.03 | |
| 2 |  | B. Caudill | 111 | 1982 | 70 | 12 | 9 | .571 | 0 | 2.35 | 0 | 0 | 26 | 95.2 | 65 | 25 | 25 | 9 | 35 | 1 | 64 | 4 | 380 | 2 | 10.44 | 3.29 | 3.17 | 0.85 | 29.2 | 9.2 | 1.05 | .250 | 2.35 | 6.11 | |
| 3 | | M. Brash | 107 | 2023 | 78 | 9 | 4 | .692 | 0 | 3.06 | 0 | 0 | 4 | 70.2 | 65 | 24 | 26 | 3 | 29 | 6 | 7 | 0 | 308 | 11 | 13.63 | 3.69 | 3.69 | 0.38 | 34.7 | 9.4 | 1.33 | .380 | 3.31 | 8.28 | |
| 4 | | P. Sewald | 104 | 2021 | 62 | 10 | 3 | .769 | 0 | 3.06 | 0 | 0 | 11 | 64.2 | 42 | 22 | 24 | 10 | 24 | 0 | 18 | 5 | 264 | 2 | 14.47 | 3.34 | 4.33 | 1.39 | 39.4 | 9.1 | 1.02 | .254 | 3.34 | 5.85 | |
| 5 | | J.J. Putz | 104 | 2006 | 72 | 4 | 1 | .800 | 0 | 2.30 | 0 | 0 | 36 | 78.1 | 59 | 20 | 20 | 4 | 13 | 2 | 57 | 1 | 303 | 1 | 11.95 | 1.49 | 8.00 | 0.46 | 34.3 | 4.3 | 0.92 | .306 | 2.30 | 6.78 | |
| 6 |  | A. Muñoz | 96 | 2022 | 64 | 2 | 5 | .286 | 0 | 2.49 | 0 | 0 | 4 | 65.0 | 43 | 18 | 20 | 5 | 15 | 4 | 12 | 3 | 248 | 4 | 13.29 | 2.08 | 6.40 | 0.69 | 38.7 | 6.0 | 0.89 | .297 | 2.77 | 5.95 | |
| 7 | | J. Nelson | 96 | 1995 | 62 | 7 | 3 | .700 | 0 | 2.17 | 0 | 0 | 2 | 78.2 | 58 | 19 | 21 | 4 | 27 | 6 | 24 | 5 | 318 | 1 | 10.98 | 3.09 | 3.56 | 0.46 | 30.2 | 8.5 | 1.08 | .292 | 2.40 | 6.64 | |
| 8 | | M. Jackson | 94 | 1989 | 65 | 4 | 6 | .400 | 0 | 3.17 | 0 | 0 | 7 | 99.1 | 81 | 35 | 43 | 8 | 54 | 6 | 27 | 6 | 431 | 1 | 8.52 | 4.89 | 1.74 | 0.72 | 21.8 | 12.5 | 1.36 | .271 | 3.90 | 7.34 | |
| 9 | | C. Smith | 92 | 2015 | 70 | 2 | 5 | .286 | 0 | 2.31 | 0 | 0 | 13 | 70.0 | 49 | 18 | 19 | 2 | 22 | 7 | 24 | 4 | 284 | 6 | 11.83 | 2.83 | 4.18 | 0.26 | 32.4 | 7.7 | 1.01 | .292 | 2.44 | 6.30 | |
| 10 | | B. Ayala | 92 | 1997 | 71 | 10 | 5 | .667 | 0 | 3.82 | 0 | 0 | 8 | 96.2 | 91 | 41 | 45 | 14 | 41 | 3 | 33 | 3 | 403 | 6 | 8.57 | 3.82 | 2.24 | 1.30 | 22.8 | 10.2 | 1.37 | .304 | 4.19 | 8.47 | |
| 11 | | E. Romo | 92 | 1977 | 55 | 8 | 9 | .471 | 0 | 3.01 | 0 | 0 | 16 | 98.2 | 81 | 33 | 37 | 7 | 32 | 5 | 39 | 7 | 399 | 1 | 8.39 | 2.92 | 2.88 | 0.64 | 23.1 | 8.0 | 1.15 | .281 | 3.38 | 7.39 | |
| 12 | | A. Muñoz | 89 | 2026 | 61 | 5 | 6 | .455 | 0 | 4.24 | 0 | 0 | 28 | 57.1 | 46 | 27 | 29 | 9 | 24 | 1 | 48 | 0 | 240 | 2 | 13.97 | 3.77 | 3.71 | 1.41 | 37.1 | 10.0 | 1.22 | .316 | 4.55 | 7.22 | |
| 13 | | E. Díaz | 89 | 2017 | 66 | 4 | 6 | .400 | 0 | 3.27 | 0 | 0 | 34 | 66.0 | 44 | 24 | 28 | 10 | 32 | 3 | 52 | 2 | 278 | 3 | 12.14 | 4.36 | 2.78 | 1.36 | 32.0 | 11.5 | 1.15 | .236 | 3.82 | 6.00 | |
| 14 | | E. Díaz | 88 | 2016 | 49 | 0 | 4 | .000 | 0 | 2.79 | 0 | 0 | 18 | 51.2 | 45 | 16 | 16 | 5 | 15 | 3 | 23 | 2 | 217 | 6 | 15.33 | 2.61 | 5.87 | 0.87 | 40.6 | 6.9 | 1.16 | .377 | 2.79 | 7.84 | |
| 15 | | J. Nelson | 88 | 2001 | 69 | 4 | 3 | .571 | 0 | 2.76 | 0 | 0 | 4 | 65.1 | 30 | 20 | 21 | 3 | 44 | 6 | 16 | 1 | 273 | 2 | 12.12 | 6.06 | 2.00 | 0.41 | 32.2 | 16.1 | 1.13 | .205 | 2.89 | 4.13 | |
| 16 | | T. Wilhelmsen | 87 | 2012 | 73 | 4 | 3 | .571 | 0 | 2.50 | 0 | 0 | 29 | 79.1 | 59 | 22 | 24 | 5 | 29 | 2 | 48 | 3 | 326 | 3 | 9.87 | 3.29 | 3.00 | 0.57 | 26.7 | 8.9 | 1.11 | .266 | 2.72 | 6.69 | |
| 17 | | J. Mesa | 84 | 2000 | 66 | 4 | 6 | .400 | 0 | 5.36 | 0 | 0 | 1 | 80.2 | 89 | 48 | 48 | 11 | 41 | 5 | 29 | 0 | 372 | 3 | 9.37 | 4.57 | 2.05 | 1.23 | 22.6 | 11.0 | 1.61 | .338 | 5.36 | 9.93 | |
| 18 | | A. Muñoz | 83 | 2025 | 64 | 3 | 3 | .500 | 0 | 1.73 | 0 | 0 | 38 | 62.1 | 36 | 12 | 18 | 2 | 28 | 4 | 47 | 3 | 254 | 7 | 11.98 | 4.04 | 2.96 | 0.29 | 32.7 | 11.0 | 1.03 | .248 | 2.60 | 5.20 | |
| 19 | | A. Rhodes | 83 | 2001 | 71 | 8 | 0 | 1.000 | 0 | 1.72 | 0 | 0 | 3 | 68.0 | 46 | 13 | 14 | 5 | 12 | 1 | 16 | 0 | 258 | 3 | 10.99 | 1.59 | 6.92 | 0.66 | 32.2 | 4.7 | 0.85 | .261 | 1.85 | 6.09 | |
| 20 | | G. Speier | 82 | 2025 | 76 | 4 | 3 | .571 | 0 | 2.61 | 0 | 0 | 0 | 62.0 | 43 | 18 | 19 | 5 | 11 | 5 | 4 | 1 | 243 | 1 | 11.90 | 1.60 | 7.45 | 0.73 | 33.7 | 4.5 | 0.87 | .271 | 2.76 | 6.24 | |
| 21 | | E. Bazardo | 82 | 2025 | 73 | 5 | 0 | 1.000 | 0 | 2.52 | 0 | 0 | 0 | 78.2 | 53 | 22 | 23 | 9 | 27 | 2 | 18 | 2 | 313 | 2 | 9.38 | 3.09 | 3.04 | 1.03 | 26.2 | 8.6 | 1.02 | .228 | 2.63 | 6.06 | |
| 22 | | J.J. Putz | 82 | 2007 | 68 | 6 | 1 | .857 | 0 | 1.38 | 0 | 0 | 40 | 71.2 | 37 | 11 | 11 | 6 | 13 | 2 | 65 | 0 | 260 | 3 | 10.30 | 1.63 | 6.31 | 0.75 | 31.5 | 5.0 | 0.70 | .197 | 1.38 | 4.65 | |
| 23 | | D. Farquhar | 81 | 2014 | 66 | 3 | 1 | .750 | 0 | 2.66 | 0 | 0 | 1 | 71.0 | 58 | 21 | 23 | 5 | 22 | 4 | 22 | 1 | 290 | 6 | 10.27 | 2.79 | 3.68 | 0.63 | 27.9 | 7.6 | 1.13 | .298 | 2.92 | 7.35 | |
| 24 | | A. Rhodes | 81 | 2002 | 66 | 10 | 4 | .714 | 0 | 2.33 | 0 | 0 | 2 | 69.2 | 45 | 18 | 18 | 4 | 13 | 0 | 9 | 1 | 257 | 2 | 10.46 | 1.68 | 6.23 | 0.52 | 31.5 | 5.1 | 0.83 | .258 | 2.33 | 5.81 | |
| 25 | | C. Furbush | 80 | 2013 | 71 | 2 | 6 | .250 | 0 | 3.74 | 0 | 0 | 0 | 65.0 | 48 | 27 | 33 | 5 | 29 | 3 | 5 | 2 | 280 | 3 | 11.08 | 4.02 | 2.76 | 0.69 | 28.6 | 10.4 | 1.18 | .264 | 4.57 | 6.65 | |
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SEAStatMuse has game-level data for strikeouts 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 |
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 Braves - y | 93 | 65 | .589 | |
87 | 71 | .551 | 6.0 | |
78 | 80 | .494 | 15.0 | |
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| NL Central | W | L | PCT | GB |
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80 | 78 | .506 | 19.0 | |
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| NL West | W | L | PCT | GB |
 Dodgers - y | 97 | 60 | .618 | |
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