Zachary Edward Muckenhirn (born February 27, 1995) is an American professional baseball pitcher for the Sultanes de Monterrey of the Mexican League.
[2] He made his professional debut with the Low-A Aberdeen IronBirds, appearing in 12 games and registering a 5–2 record and 2.43 ERA with 34 strikeouts.
The following year, Muckenhirn made 44 relief appearances split between Delmarva, the High-A Frederick Keys, and the Double-A Bowie Baysox, recording a cumulative 3.64 ERA with 79 strikeouts and eight saves in 64+1⁄3 innings pitched.
[7] He spent the year with the Double-A Birmingham Barons, appearing in 30 games and posting a 3–1 record and 1.77 ERA with 42 strikeouts in 40+2⁄3 innings pitched.
[9] He competed for a bullpen spot in Spring Training,[10] but did not win the job and was assigned to the Triple-A Syracuse Mets to begin the 2023 season.
On May 1, 2023, the Mets selected Muckenhirn to the 40-man roster and promoted him to the major leagues for the first time in advance of the team's doubleheader against the Atlanta Braves.