Sean Doolittle had a record of 10-10 with an ERA of 2.92, 169 strikeouts and 75 saves in 153 appearances for the Nationals in his career.
| 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 |  | S. Doolittle | 2017 |  WSH | 30 | 1 | 0 | 1.000 | 0 | 2.40 | 31 | 0 | 0 | 21 | 30.0 | 22 | 8 | 10 | 2 | 8 | 0 | 28 | 1 | 118 | 2 | 9.30 | 2.40 | 3.88 | 0.60 | 26.3 | 6.8 | 1.00 | .260 | 3.00 | 54 | 2.75 | 62 | 6.60 | 5.4 |
| 2 | | S. Doolittle | 2018 | WSH | 43 | 3 | 3 | .500 | 0 | 1.60 | 60 | 0 | 0 | 25 | 45.0 | 21 | 8 | 8 | 3 | 6 | 2 | 35 | 1 | 163 | 1 | 12.00 | 1.20 | 10.00 | 0.60 | 36.8 | 3.7 | 0.60 | .196 | 1.60 | 39 | 1.89 | 46 | 4.20 | 11.1 |
| 3 | | S. Doolittle | 2019 | WSH | 63 | 6 | 5 | .545 | 0 | 4.05 | 66 | 0 | 0 | 29 | 60.0 | 63 | 27 | 27 | 11 | 15 | 2 | 55 | 2 | 260 | 0 | 9.90 | 2.25 | 4.40 | 1.65 | 25.4 | 5.8 | 1.30 | .313 | 4.05 | 91 | 4.24 | 95 | 9.45 | 1.6 |
| 4 | | S. Doolittle | 2020 | WSH | 11 | 0 | 2 | .000 | 0 | 5.87 | 6 | 0 | 0 | 0 | 7.2 | 9 | 5 | 6 | 3 | 4 | 0 | 3 | 2 | 36 | 0 | 7.04 | 4.70 | 1.50 | 3.52 | 16.7 | 11.1 | 1.70 | .261 | 7.04 | 130 | 8.27 | 182 | 10.57 | -3.1 |
| 5 | | S. Doolittle | 2022 | WSH | 6 | 0 | 0 | 0 | 0.00 | 6 | 0 | 0 | 0 | 5.1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17 | 0 | 10.13 | 0.00 | 0.00 | 35.3 | 0.0 | 0.19 | .091 | 0.00 | 0 | 0.86 | 21 | 1.69 | 1.9 | ||
| Total | 153 | 10 | 10 | .500 | 0 | 2.92 | 169 | 0 | 0 | 75 | 148.0 | 116 | 48 | 51 | 19 | 33 | 4 | 121 | 6 | 594 | 3 | 10.28 | 2.01 | 5.12 | 1.16 | 28.5 | 5.6 | 1.01 | .263 | 3.10 | 67 | 3.31 | 75 | 7.05 | 16.8 |
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