Team pitching -- 2021 Boston Red Sox
Regular season -- as of 9/28/2021
| Primary |
 | Name | P | ERA | W | L | S | G | GS | CG | SHO | INN | H | R | ER | BB | K | HR | GDP | BF |
| | Morgan,A* | mr | 2.22 | 1 | 0 | 1 | 27 | 0 | 0 | 0 | 24.1 | 19 | 8 | 6 | 9 | 34 | 2 | 0 | 104 |
| | Romo | cl | 2.28 | 6 | 2 | 8 | 42 | 0 | 0 | 0 | 51.1 | 30 | 13 | 13 | 10 | 63 | 8 | 4 | 193 |
| | Almonte,Y | mr | 2.41 | 3 | 1 | 7 | 65 | 0 | 0 | 0 | 74.2 | 60 | 22 | 20 | 30 | 68 | 4 | 8 | 309 |
| | Graterol,B | mr | 2.54 | 2 | 1 | 2 | 35 | 0 | 0 | 0 | 46.0 | 36 | 13 | 13 | 21 | 44 | 5 | 4 | 190 |
| | Jackson,L | cl | 2.99 | 4 | 1 | 9 | 59 | 0 | 0 | 0 | 78.1 | 71 | 29 | 26 | 27 | 100 | 8 | 5 | 331 |
| | Alvarez,J* | mr | 3.44 | 1 | 1 | 6 | 50 | 0 | 0 | 0 | 55.0 | 42 | 21 | 21 | 11 | 63 | 1 | 4 | 215 |
| | Smith,J | mr | 3.51 | 3 | 3 | 6 | 42 | 0 | 0 | 0 | 41.0 | 36 | 17 | 16 | 13 | 34 | 4 | 1 | 173 |
| | Rodriguez,E* | sp | 3.80 | 15 | 9 | 0 | 30 | 30 | 0 | 0 | 180.0 | 169 | 88 | 76 | 53 | 185 | 23 | 18 | 751 |
| | Blach* | sp | 4.00 | 7 | 8 | 0 | 21 | 21 | 1 | 0 | 123.2 | 142 | 65 | 55 | 29 | 72 | 14 | 20 | 528 |
| | Romano,S | mr | 4.01 | 3 | 5 | 1 | 25 | 12 | 1 | 0 | 94.1 | 93 | 46 | 42 | 21 | 76 | 12 | 7 | 389 |
| f | Robles,H | cl | 4.23 | 2 | 4 | 5 | 42 | 0 | 0 | 0 | 66.0 | 74 | 34 | 31 | 16 | 77 | 10 | 9 | 285 |
| | Holland,G | cl | 4.54 | 1 | 2 | 3 | 47 | 0 | 0 | 0 | 37.2 | 41 | 21 | 19 | 24 | 34 | 5 | 4 | 174 |
| f | Smeltzer* | sp | 4.73 | 11 | 9 | 0 | 26 | 26 | 0 | 0 | 150.1 | 148 | 80 | 79 | 47 | 134 | 28 | 14 | 633 |
| | Clarke | sp | 5.09 | 7 | 9 | 0 | 24 | 24 | 0 | 0 | 123.2 | 130 | 76 | 70 | 47 | 107 | 17 | 9 | 552 |
| | Pena,Fe | sp | 5.14 | 2 | 8 | 0 | 25 | 13 | 1 | 0 | 91.0 | 104 | 67 | 52 | 30 | 92 | 17 | 10 | 403 |
| | Bettis | mr | 5.62 | 6 | 8 | 1 | 33 | 12 | 0 | 0 | 97.2 | 108 | 72 | 61 | 29 | 61 | 19 | 7 | 434 |
| | Margevicius* | sp | 6.17 | 6 | 11 | 0 | 24 | 24 | 0 | 0 | 135.2 | 169 | 103 | 93 | 32 | 98 | 26 | 12 | 600 |
|   | Total |   | 4.24 | 80 | 82 | 49 | 162 | 162 | 3 | 5 | 1470.2 | 1472 | 775 | 693 | 449 | 1342 | 203 | 136 | 6264 |
| Secondary |
 | Name | P | SB | CS | IW | HBP | WP | BK | SH | SF | CI | H/9 | BB/9 | R/9 | K/9 | HR/9 | K/BB | NP/G | STR% |
| | Morgan,A* | mr | 0 | 0 | 0 | 2 | 2 | 0 | 0 | 0 | 0 | 7.0 | 3.3 | 11.1 | 12.6 | 0.7 | 3.8 | 16.8 | .638 |
| | Romo | cl | 2 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | 5.3 | 1.8 | 7.2 | 11.0 | 1.4 | 6.3 | 18.8 | .643 |
| | Almonte,Y | mr | 4 | 2 | 1 | 2 | 3 | 0 | 0 | 2 | 0 | 7.2 | 3.6 | 11.1 | 8.2 | 0.5 | 2.3 | 18.4 | .586 |
| | Graterol,B | mr | 0 | 1 | 0 | 0 | 2 | 0 | 1 | 3 | 0 | 7.0 | 4.1 | 11.2 | 8.6 | 1.0 | 2.1 | 22.3 | .591 |
| | Jackson,L | cl | 4 | 3 | 1 | 6 | 12 | 0 | 0 | 2 | 0 | 8.2 | 3.1 | 11.9 | 11.5 | 0.9 | 3.7 | 22.6 | .618 |
| | Alvarez,J* | mr | 1 | 0 | 0 | 2 | 2 | 0 | 0 | 3 | 0 | 6.9 | 1.8 | 9.0 | 10.3 | 0.2 | 5.7 | 16.4 | .644 |
| | Smith,J | mr | 0 | 1 | 1 | 3 | 2 | 0 | 0 | 4 | 0 | 7.9 | 2.9 | 11.4 | 7.5 | 0.9 | 2.6 | 15.3 | .623 |
| | Rodriguez,E* | sp | 3 | 5 | 1 | 5 | 2 | 0 | 0 | 5 | 0 | 8.4 | 2.6 | 11.3 | 9.3 | 1.1 | 3.5 | 98.1 | .636 |
| | Blach* | sp | 2 | 3 | 3 | 5 | 5 | 0 | 0 | 3 | 0 | 10.3 | 2.1 | 12.8 | 5.2 | 1.0 | 2.5 | 92.5 | .632 |
| | Romano,S | mr | 1 | 2 | 0 | 1 | 2 | 1 | 1 | 1 | 0 | 8.9 | 2.0 | 11.0 | 7.3 | 1.1 | 3.6 | 57.4 | .635 |
| f | Robles,H | cl | 0 | 1 | 0 | 3 | 2 | 1 | 0 | 2 | 0 | 10.1 | 2.2 | 12.7 | 10.5 | 1.4 | 4.8 | 25.5 | .656 |
| | Holland,G | cl | 1 | 0 | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 9.8 | 5.7 | 15.5 | 8.1 | 1.2 | 1.4 | 15.4 | .584 |
| f | Smeltzer* | sp | 5 | 3 | 4 | 2 | 3 | 0 | 0 | 4 | 0 | 8.9 | 2.8 | 11.8 | 8.0 | 1.7 | 2.9 | 90.3 | .640 |
| | Clarke | sp | 10 | 2 | 0 | 12 | 4 | 0 | 0 | 3 | 0 | 9.5 | 3.4 | 13.8 | 7.8 | 1.2 | 2.3 | 89.5 | .619 |
| | Pena,Fe | sp | 0 | 1 | 0 | 2 | 5 | 1 | 0 | 3 | 0 | 10.3 | 3.0 | 13.5 | 9.1 | 1.7 | 3.1 | 61.9 | .615 |
| | Bettis | mr | 0 | 4 | 0 | 10 | 5 | 1 | 0 | 3 | 0 | 10.0 | 2.7 | 13.5 | 5.6 | 1.8 | 2.1 | 45.3 | .646 |
| | Margevicius* | sp | 3 | 1 | 0 | 3 | 4 | 1 | 0 | 1 | 0 | 11.2 | 2.1 | 13.5 | 6.5 | 1.7 | 3.1 | 89.4 | .643 |
|   | Total |   | 36 | 29 | 11 | 59 | 61 | 5 | 2 | 40 | 0 | 9.0 | 2.7 | 12.1 | 8.2 | 1.2 | 3.0 |   | .629 |
| Analytical |
 | Name | P | OPS | WHIP | BIP | BABIP | TBW | /BF | TBWH | /BF | RC | RC27 | RCERA | CERA |
| | Morgan,A* | mr | .590 | 1.15 | 57 | .298 | 37 | .356 | 39 | .375 | 8.9 | 3.2 | 2.96 | 2.88 |
| | Romo | cl | .561 | 0.78 | 111 | .198 | 73 | .378 | 74 | .383 | 12.9 | 2.2 | 2.04 | 1.65 |
| | Almonte,Y | mr | .607 | 1.21 | 205 | .273 | 115 | .372 | 117 | .379 | 25.5 | 3.0 | 2.77 | 2.82 |
| | Graterol,B | mr | .659 | 1.24 | 120 | .258 | 80 | .421 | 80 | .421 | 18.2 | 3.6 | 3.21 | 3.21 |
| | Jackson,L | cl | .689 | 1.25 | 190 | .332 | 138 | .417 | 144 | .435 | 35.5 | 4.1 | 3.67 | 3.66 |
| | Alvarez,J* | mr | .542 | 0.96 | 138 | .297 | 68 | .316 | 70 | .326 | 14.8 | 2.4 | 2.18 | 1.81 |
| | Smith,J | mr | .660 | 1.20 | 119 | .269 | 68 | .393 | 71 | .410 | 17.6 | 3.9 | 3.48 | 3.29 |
| | Rodriguez,E* | sp | .719 | 1.23 | 485 | .301 | 340 | .453 | 345 | .459 | 83.1 | 4.1 | 3.74 | 3.62 |
| | Blach* | sp | .796 | 1.38 | 408 | .314 | 256 | .485 | 261 | .494 | 68.9 | 5.0 | 4.51 | 4.54 |
| | Romano,S | mr | .729 | 1.21 | 279 | .290 | 179 | .460 | 180 | .463 | 45.0 | 4.3 | 3.87 | 3.54 |
| f | Robles,H | cl | .777 | 1.36 | 179 | .358 | 135 | .474 | 138 | .484 | 36.4 | 4.9 | 4.47 | 4.68 |
| | Holland,G | cl | .794 | 1.73 | 111 | .324 | 87 | .500 | 87 | .500 | 24.5 | 5.8 | 5.26 | 5.82 |
| f | Smeltzer* | sp | .780 | 1.30 | 422 | .284 | 319 | .504 | 321 | .507 | 82.0 | 4.9 | 4.42 | 4.26 |
| | Clarke | sp | .773 | 1.43 | 369 | .306 | 258 | .467 | 270 | .489 | 75.2 | 5.4 | 4.92 | 4.92 |
| | Pena,Fe | sp | .837 | 1.47 | 262 | .332 | 214 | .531 | 216 | .536 | 60.1 | 5.8 | 5.35 | 5.30 |
| | Bettis | mr | .846 | 1.40 | 315 | .283 | 228 | .525 | 238 | .548 | 66.0 | 6.0 | 5.48 | 5.34 |
| | Margevicius* | sp | .845 | 1.48 | 441 | .324 | 317 | .528 | 320 | .533 | 94.3 | 6.2 | 5.63 | 5.57 |
|   | Total |   | .747 | 1.31 | 4211 | .301 | 2912 | .465 | 2971 | .474 | 762.9 | 4.6 | 4.20 | 4.12 |
| Start |
 | Name | P | GS | CG | CG% | SHO | QS | QS% | RS | RS/G | RL | RLS | RL% |
| | Morgan,A* | mr | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 16 | 0 | .000 |
| | Romo | cl | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 4 | 0 | .000 |
| | Almonte,Y | mr | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 26 | 4 | .154 |
| | Graterol,B | mr | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 16 | 3 | .188 |
| | Jackson,L | cl | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 23 | 4 | .174 |
| | Alvarez,J* | mr | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 23 | 13 | .565 |
| | Smith,J | mr | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 18 | 5 | .278 |
| | Rodriguez,E* | sp | 30 | 0 | .000 | 0 | 17 | .567 | 165 | 5.5 | 22 | 6 | .273 |
| | Blach* | sp | 21 | 1 | .048 | 0 | 11 | .524 | 85 | 4.0 | 7 | 0 | .000 |
| | Romano,S | mr | 12 | 1 | .083 | 0 | 6 | .500 | 52 | 4.3 | 14 | 5 | .357 |
| f | Robles,H | cl | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 13 | 2 | .154 |
| | Holland,G | cl | 0 | 0 | .000 | 0 | 0 | .000 | 0 | 0.0 | 28 | 4 | .143 |
| f | Smeltzer* | sp | 26 | 0 | .000 | 0 | 14 | .538 | 99 | 3.8 | 10 | 4 | .400 |
| | Clarke | sp | 24 | 0 | .000 | 0 | 10 | .417 | 106 | 4.4 | 18 | 8 | .444 |
| | Pena,Fe | sp | 13 | 1 | .077 | 0 | 6 | .462 | 52 | 4.0 | 15 | 5 | .333 |
| | Bettis | mr | 12 | 0 | .000 | 0 | 2 | .167 | 52 | 4.3 | 14 | 7 | .500 |
| | Margevicius* | sp | 24 | 0 | .000 | 0 | 7 | .292 | 119 | 5.0 | 21 | 14 | .667 |
|   | Total |   | 162 | 3 | .019 | 5 | 73 | .451 | 730 | 4.5 | 288 | 84 | .292 |
| Relief |
 | Name | P | SVO | S | SV% | BS | BS% | HLD | IR | IRS | IR% | G | GR | GF |
| | Morgan,A* | mr | 4 | 1 | .250 | 2 | .500 | 8 | 12 | 3 | .250 | 27 | 27 | 3 |
| | Romo | cl | 11 | 8 | .727 | 2 | .182 | 4 | 21 | 3 | .143 | 42 | 42 | 24 |
| | Almonte,Y | mr | 12 | 7 | .583 | 3 | .250 | 14 | 37 | 12 | .324 | 65 | 65 | 22 |
| | Graterol,B | mr | 4 | 2 | .500 | 2 | .500 | 6 | 23 | 10 | .435 | 35 | 35 | 9 |
| | Jackson,L | cl | 12 | 9 | .750 | 2 | .167 | 6 | 44 | 10 | .227 | 59 | 59 | 23 |
| | Alvarez,J* | mr | 6 | 6 | 1.000 | 0 | .000 | 11 | 31 | 8 | .258 | 50 | 50 | 16 |
| | Smith,J | mr | 8 | 6 | .750 | 0 | .000 | 5 | 27 | 5 | .185 | 42 | 42 | 20 |
| | Rodriguez,E* | sp | 0 | 0 | .000 | 0 | .000 | 0 | 0 | 0 | .000 | 30 | 0 | 0 |
| | Blach* | sp | 0 | 0 | .000 | 0 | .000 | 0 | 0 | 0 | .000 | 21 | 0 | 0 |
| | Romano,S | mr | 1 | 1 | 1.000 | 0 | .000 | 0 | 13 | 5 | .385 | 25 | 13 | 5 |
| f | Robles,H | cl | 7 | 5 | .714 | 1 | .143 | 5 | 32 | 8 | .250 | 42 | 42 | 18 |
| | Holland,G | cl | 9 | 3 | .333 | 3 | .333 | 14 | 28 | 12 | .429 | 47 | 47 | 10 |
| f | Smeltzer* | sp | 0 | 0 | .000 | 0 | .000 | 0 | 0 | 0 | .000 | 26 | 0 | 0 |
| | Clarke | sp | 0 | 0 | .000 | 0 | .000 | 0 | 0 | 0 | .000 | 24 | 0 | 0 |
| | Pena,Fe | sp | 0 | 0 | .000 | 0 | .000 | 1 | 6 | 5 | .833 | 25 | 12 | 2 |
| | Bettis | mr | 1 | 1 | 1.000 | 0 | .000 | 1 | 14 | 3 | .214 | 33 | 21 | 7 |
| | Margevicius* | sp | 0 | 0 | .000 | 0 | .000 | 0 | 0 | 0 | .000 | 24 | 0 | 0 |
|   | Total |   | 75 | 49 | .653 | 15 | .200 | 75 | 288 | 84 | .292 | 162 | 455 | 159 |