| 06/06/2013 |
Drafted by the Philadelphia Phillies in the 22nd round of the 2013 MLB June Amateur Draft from New Jersey Institute of Technology (Newark, NJ). |
| 09/01/2018 |
Selected off waivers by the Toronto Blue Jays from the Philadelphia Phillies. |
| 11/04/2019 |
Granted free agency. |
| 02/13/2020 |
Signed as a Free Agent with the Arizona Diamondbacks. |
| 05/22/2020 |
Released by the Arizona Diamondbacks. |
| 03/25/2021 |
Signed as a Free Agent with the Detroit Tigers. |
| 11/07/2021 |
Granted Free Agency. |
| 12/15/2021 |
Signed by the Chicago Cubs as a free agent. |
| 01/22/2023 |
Granted Free Agency. |
| 01/30/2023 |
Signed as a Free Agent with the Chicago Cubs. |
| 06/23/2024 |
Chicago Cubs placed RHP Mark Leiter Jr. on the 15-day injured list. Right forearm strain. [Auto] |
| 07/09/2024 |
Chicago Cubs activated RHP Mark Leiter Jr. from the 15-day injured list. [Auto] |
| 07/30/2024 |
Chicago Cubs traded RHP Mark Leiter Jr. to New York Yankees for SS Benjamin Cowles and RHP Jack Neely. [Auto] |
| 09/26/2024 |
New York Yankees placed RHP Mark Leiter Jr. on the paternity list. [Auto] |
| 09/29/2024 |
New York Yankees activated RHP Mark Leiter Jr. from the paternity list. [Auto] |
| 10/05/2024 |
RHP Mark Leiter Jr. roster status changed by New York Yankees. [Auto] |
| 10/18/2024 |
New York Yankees activated RHP Mark Leiter Jr.. [Auto] |
| 01/01/2025 |
OSA scouting updated ratings (potential): Stuff: 70 (70); Movement: 45 (45); Control: 50 (50). |
| 01/01/2025 |
OSA scouting updated ratings (potential): Stuff: 70 (70); Movement: 45 (45); Control: 50 (50). |