Mark Leiter Jr.
Position: Pitcher
Bats: Right • Throws: Right
Born: 1991-03-13, Fort Lauderdale, USA
Age: 35
Height/Weight: 6' 0" / 210 lbs
MLB Debut: 2017-04-28
Nickname: Junior
College: New Jersey Inst of Tech
Draft: 2013 (Round 22, Pick #661)
Status: Active
Next NYY Game: 09-10 vs COL
Player Biography & Career Profile
Mark Leiter Jr. (known as "Junior") is an American professional baseball pitcher for the New York Yankees in Major League Baseball (MLB). Born on March 13, 1991 in Fort Lauderdale, USA, he bats right and throws right. Prior to joining the major leagues, he attended New Jersey Inst of Tech and was selected by the New York Yankees in 2013 (Round 22, Pick #661).
Mark Leiter Jr. made his Major League Baseball debut on April 28, 2017. Across 9 seasons on the mound, he pitched 382.5 innings with 434 strikeouts and an ERA of 4.61. His career accolades include honors such as INT Pitcher of the Month, FSL Mid-Season All-Star, FSL Pitcher of the Week. Today, Mark Leiter Jr. remains a vital everyday leader and fan favorite in the Bronx.
| Year | W | L | ERA | G | GS | SV | IP | SO | WHIP |
|---|---|---|---|---|---|---|---|---|---|
| 2026 Regular Season | 0 | 1 | 4.28 | 36 | 0 | 4 | 33.2 | 38 | 1.31 |
| Career Regular Season | 16 | 30 | 4.61 | 306 | 306 | 13 | 382.5 | 434 | 1.34 |
Career Statistics
Tm: Athletics Lg: American League W: 0 L: 1 ERA: 4.28 G: 36 GS: 0 SV: 4 IP: 33.2 H: 33 R: 16 ER: 16 HR: 2 BB: 11 SO: 38 WHIP: 1.31
Tm: New York Yankees Lg: American League W: 6 L: 7 ERA: 4.84 G: 59 GS: 0 SV: 2 IP: 48.1 H: 57 R: 31 ER: 26 HR: 5 BB: 17 SO: 54 WHIP: 1.53
Lg: American League W: 4 L: 5 ERA: 4.50 G: 60 GS: 0 SV: 0 IP: 58.0 H: 55 R: 34 ER: 29 HR: 8 BB: 22 SO: 86 WHIP: 1.33
Tm: New York Yankees Lg: American League W: 2 L: 1 ERA: 4.98 G: 21 GS: 0 SV: 0 IP: 21.2 H: 28 R: 14 ER: 12 HR: 6 BB: 9 SO: 33 WHIP: 1.71
Tm: Chicago Cubs Lg: National League W: 2 L: 4 ERA: 4.21 G: 39 GS: 0 SV: 0 IP: 36.1 H: 27 R: 20 ER: 17 HR: 2 BB: 13 SO: 53 WHIP: 1.10
Tm: Chicago Cubs Lg: National League W: 1 L: 3 ERA: 3.50 G: 69 GS: 0 SV: 4 IP: 64.1 H: 48 R: 27 ER: 25 HR: 7 BB: 24 SO: 77 WHIP: 1.12
Tm: Chicago Cubs Lg: National League W: 2 L: 7 ERA: 3.99 G: 35 GS: 4 SV: 3 IP: 67.2 H: 52 R: 32 ER: 30 HR: 10 BB: 25 SO: 73 WHIP: 1.14
Lg: American League W: 0 L: 1 ERA: 7.71 G: 20 GS: 0 SV: 0 IP: 23.1 H: 35 R: 28 ER: 20 HR: 7 BB: 12 SO: 22 WHIP: 2.01
Tm: Toronto Blue Jays Lg: American League W: 0 L: 0 ERA: 13.50 G: 8 GS: 0 SV: 0 IP: 6.2 H: 13 R: 11 ER: 10 HR: 2 BB: 4 SO: 9 WHIP: 2.55
Tm: Philadelphia Phillies Lg: National League W: 0 L: 1 ERA: 5.40 G: 12 GS: 0 SV: 0 IP: 16.2 H: 22 R: 17 ER: 10 HR: 5 BB: 8 SO: 13 WHIP: 1.80
Tm: Philadelphia Phillies Lg: National League W: 3 L: 6 ERA: 4.96 G: 27 GS: 11 SV: 0 IP: 90.2 H: 90 R: 59 ER: 50 HR: 18 BB: 31 SO: 84 WHIP: 1.33
| Year | Age | Tm | Lg | W | L | ERA | G | GS | SV | IP | H | R | ER | HR | BB | SO | WHIP |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | Athletics | American League | 0 | 1 | 4.28 | 36 | 0 | 4 | 33.2 | 33 | 16 | 16 | 2 | 11 | 38 | 1.31 | |
| 2025 | New York Yankees | American League | 6 | 7 | 4.84 | 59 | 0 | 2 | 48.1 | 57 | 31 | 26 | 5 | 17 | 54 | 1.53 | |
| 2024 | American League | 4 | 5 | 4.50 | 60 | 0 | 0 | 58.0 | 55 | 34 | 29 | 8 | 22 | 86 | 1.33 | ||
| 2024 | New York Yankees | American League | 2 | 1 | 4.98 | 21 | 0 | 0 | 21.2 | 28 | 14 | 12 | 6 | 9 | 33 | 1.71 | |
| 2024 | Chicago Cubs | National League | 2 | 4 | 4.21 | 39 | 0 | 0 | 36.1 | 27 | 20 | 17 | 2 | 13 | 53 | 1.10 | |
| 2023 | Chicago Cubs | National League | 1 | 3 | 3.50 | 69 | 0 | 4 | 64.1 | 48 | 27 | 25 | 7 | 24 | 77 | 1.12 | |
| 2022 | Chicago Cubs | National League | 2 | 7 | 3.99 | 35 | 4 | 3 | 67.2 | 52 | 32 | 30 | 10 | 25 | 73 | 1.14 | |
| 2018 | American League | 0 | 1 | 7.71 | 20 | 0 | 0 | 23.1 | 35 | 28 | 20 | 7 | 12 | 22 | 2.01 | ||
| 2018 | Toronto Blue Jays | American League | 0 | 0 | 13.50 | 8 | 0 | 0 | 6.2 | 13 | 11 | 10 | 2 | 4 | 9 | 2.55 | |
| 2018 | Philadelphia Phillies | National League | 0 | 1 | 5.40 | 12 | 0 | 0 | 16.2 | 22 | 17 | 10 | 5 | 8 | 13 | 1.80 | |
| 2017 | Philadelphia Phillies | National League | 3 | 6 | 4.96 | 27 | 11 | 0 | 90.2 | 90 | 59 | 50 | 18 | 31 | 84 | 1.33 |
🏆 Career Awards & Honors
3 Total AwardsINT Pitcher of the Month
Jul 31, 2021FSL Mid-Season All-Star
Jun 20, 2015FSL Pitcher of the Week
Jul 21, 2014📋 Latest Roster Transactions
Official MLB Roster LogAthletics transferred RHP Mark Leiter Jr. from the 15-day injured list to the 60-day injured list. Right hip impingement.
Athletics placed RHP Mark Leiter Jr. on the 15-day injured list retroactive to July 19, 2026. Right hip impingement.
Athletics activated RHP Mark Leiter Jr. from the 15-day injured list.
Athletics placed RHP Mark Leiter Jr. on the 15-day injured list retroactive to June 18, 2026. Right hip impingement.
RHP Mark Leiter Jr. changed number to 38.
RHP Mark Leiter Jr. changed number to 42.
Athletics signed free agent RHP Mark Leiter Jr..
RHP Mark Leiter Jr. elected free agency.
