Statistics| Year | Team | G | IP | H | BB | ER | Win | Sav | WHIP | ERA |
|---|
| 2024 | Cubs | 26 | 23.33 | 21 | 8 | 9 | 2 | 0 | 1.243 | 3.47 |
| 2023 | Cubs | 69 | 64.33 | 48 | 24 | 25 | 1 | 4 | 1.119 | 3.50 |
| 2022 | Cubs | 35 | 67.67 | 52 | 25 | 30 | 2 | 3 | 1.138 | 3.99 |
| 2018 | Tot | 20 | 23.33 | 35 | 12 | 20 | 0 | 0 | 2.014 | 7.71 |
| 2018 | Blue Jays | 8 | 6.67 | 13 | 4 | 10 | 0 | 0 | 2.550 | 13.50 |
| 2018 | Phillies | 12 | 16.67 | 22 | 8 | 10 | 0 | 0 | 1.800 | 5.40 |
| 2017 | Phillies | 27 | 90.67 | 90 | 31 | 50 | 3 | 0 | 1.335 | 4.96 |
| Total MLB | 177 | 269.33 | 246 | 100 | 134 | 8 | 7 | 1.285 | 4.48 |
| | 2021 Projections |
|---|
| Source | | G | IP | H | BB | ER | Win | Sav | WHIP | ERA |
|---|
| Consensus | 22 | 44.16 | 44 | 17 | 24 | 2 | 0 | 1.393 | 4.80 |
| Marcel | 0 | 31.66 | 32 | 13 | 17 | 2 | 1 | 1.402 | 4.80 |
| RV Current | 43 | 56.67 | 56 | 22 | 30 | 3 | 0 | 1.386 | 4.79 |
| RotoValue | 43 | 56.67 | 56 | 22 | 30 | 3 | 0 | 1.387 | 4.80 |
2021 Game Log | | Date | Time | Headline |
|---|
| Tue Aug 22 2023 | 00:15 | Mark Leiter Jr. Escapes With Save Monday | | Sat Jun 3 2023 | 08:27 | Mark Leiter Jr. Registers His Third Save On Friday | | Wed May 24 2023 | 23:48 | Mark Leiter Jr. Closes Out Mets; New Favorite For Saves? | | Sat May 6 2023 | 10:32 | Mark Leiter Jr. Grabs The Save Friday | | Mon May 1 2023 | 22:18 | Mark Leiter Jr. Secures Another Hold | | Sat Apr 8 2023 | 10:31 | Mark Leiter Jr. Earns A Hold Friday | | Thu Feb 2 2023 | 13:38 | Mark Leiter Jr. Re-Signs With Cubs | | Thu Jan 19 2023 | 18:31 | Mark Leiter Jr. Clears Waivers, Outrighted To Minors |
| |