Junichi Tazawa played 9 seasons for the Red Sox, Marlins and Angels. He had 21 wins, 26 losses, an ERA of 4.12 and 374 strikeouts. He won 1 World Series.
| NAME | SEASON | TM | G | W | L | W% | 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 | ERA- | FIP | FIP- | H/9 | PRAA | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | J. Tazawa | 2009 |  BOS | 6 | 2 | 3 | .400 | 4 | 7.46 | 13 | 0 | 0 | 0 | 25.1 | 43 | 21 | 23 | 4 | 9 | 3 | 1 | 0 | 130 | 0 | 4.62 | 3.20 | 1.44 | 1.42 | 10.0 | 6.9 | 2.05 | .386 | 8.17 | 160 | 5.53 | 128 | 15.28 | -3.5 |
| 2 | | J. Tazawa | 2011 | BOS | 3 | 0 | 0 | 0 | 6.00 | 4 | 0 | 0 | 0 | 3.0 | 3 | 2 | 2 | 1 | 1 | 0 | 2 | 0 | 13 | 0 | 12.00 | 3.00 | 4.00 | 3.00 | 30.8 | 7.7 | 1.33 | .286 | 6.00 | 141 | 5.68 | 144 | 9.00 | -0.6 | |
| 3 | | J. Tazawa | 2012 | BOS | 37 | 1 | 1 | .500 | 0 | 1.43 | 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 |
| 4 | | J. Tazawa | 2013 | BOS | 71 | 5 | 4 | .556 | 0 | 3.16 | 72 | 0 | 0 | 0 | 68.1 | 70 | 24 | 25 | 9 | 12 | 1 | 10 | 1 | 284 | 3 | 9.48 | 1.58 | 6.00 | 1.19 | 25.4 | 4.2 | 1.20 | .321 | 3.29 | 75 | 3.22 | 83 | 9.22 | 5.1 |
| 5 | | J. Tazawa | 2014 | BOS | 71 | 4 | 3 | .571 | 0 | 2.86 | 64 | 0 | 0 | 0 | 63.0 | 58 | 20 | 23 | 5 | 17 | 0 | 12 | 1 | 261 | 5 | 9.14 | 2.43 | 3.76 | 0.71 | 24.5 | 6.5 | 1.19 | .303 | 3.29 | 71 | 2.94 | 78 | 8.29 | 5.7 |
| 6 | | J. Tazawa | 2015 | BOS | 61 | 2 | 7 | .222 | 0 | 4.14 | 56 | 0 | 0 | 3 | 58.2 | 65 | 27 | 28 | 5 | 13 | 1 | 13 | 1 | 247 | 9 | 8.59 | 1.99 | 4.31 | 0.77 | 22.7 | 5.3 | 1.33 | .349 | 4.30 | 99 | 3.04 | 77 | 9.97 | 6 |
| 7 | | J. Tazawa | 2016 | BOS | 53 | 3 | 2 | .600 | 0 | 4.17 | 54 | 0 | 0 | 0 | 49.2 | 47 | 23 | 23 | 9 | 14 | 1 | 5 | 1 | 208 | 4 | 9.79 | 2.54 | 3.86 | 1.63 | 26.0 | 6.7 | 1.23 | .292 | 4.17 | 94 | 4.23 | 101 | 8.52 | -0.2 |
| 8 | | J. Tazawa | 2017 |  MIA | 55 | 3 | 5 | .375 | 0 | 5.69 | 38 | 0 | 0 | 0 | 55.1 | 55 | 35 | 35 | 8 | 22 | 2 | 8 | 4 | 238 | 2 | 6.18 | 3.58 | 1.73 | 1.30 | 16.0 | 9.2 | 1.39 | .280 | 5.69 | 138 | 4.96 | 118 | 8.95 | -5 |
| 9 | | J. Tazawa | 2018 | TOT | 31 | 1 | 1 | .500 | 0 | 7.07 | 28 | 0 | 0 | 0 | 28.0 | 35 | 22 | 24 | 7 | 16 | 0 | 10 | 3 | 134 | 1 | 9.00 | 5.14 | 1.75 | 2.25 | 20.9 | 11.9 | 1.82 | .337 | 7.71 | 183 | 6.12 | 153 | 11.25 | -6.7 |
| Total | 388 | 21 | 26 | .447 | 4 | 4.12 | 374 | 0 | 0 | 4 | 395.1 | 413 | 181 | 190 | 49 | 109 | 10 | 74 | 11 | 1,687 | 24 | 8.51 | 2.48 | 3.43 | 1.12 | 22.2 | 6.5 | 1.32 | .318 | 4.33 | 98 | 3.73 | 93 | 9.40 | 12 |
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