Joseph Cliff Gerber (born May 3, 1997) is an American professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB).
Gerber graduated from Wayzata High School in Plymouth, Minnesota in 2015. He went undrafted in the 2015 Major League Baseball draft out of high school and enrolled at the University of Illinois where he played college baseball for the Fighting Illini.
As a freshman at Illinois in 2016, Gerber pitched only six innings, compiling a 7.50 ERA. In 2017, his sophomore season, he went 2–1 with a 4.36 ERA in 33 relief innings pitched, striking out 43.
Gerber signed with Seattle and made his professional debut with the Everett AquaSox of the Class A Short Season Northwest League before being promoted to the Clinton LumberKings of the Class A Midwest League in July.
In 23+2⁄3 relief innings between the two clubs, he went 1–0 with a 2.10 ERA and 43 strikeouts. Gerber began the 2019 season with the Modesto Nuts of the Class A-Advanced California League, earning All-Star honors.
On August 4, 2020, Gerber made his MLB debut against the Los Angeles Angels, pitching one scoreless inning. He ended the 2020 season with a 1–1 record and a 4.02 ERA, striking out six batters over 15+2⁄3 innings. Gerber began the 2021 season on the injured list and underwent back surgery in July, forcing him to miss the whole year.
There are no details about his marital status. He may be married or unmarried. There are also no rumors about his wife and girlfriend.