Jordy Joe Mercer (born August 27, 1986) is an American former professional baseball infielder.

He played in Major League Baseball (MLB) for the Pittsburgh Pirates, Detroit Tigers, New York Yankees, and Washington Nationals.

Prior to beginning his professional career, he played college baseball at Oklahoma State University.

Mercer earned All-State honors in high school and played three seasons starting at shortstop for the Elk City Travelers of Oklahoma amateur baseball organization.

[1] In the summer of 2007, following his sophomore year at Oklahoma State, Mercer joined the U.S. national baseball team.

He began the 2010 season with Altoona, before receiving a promotion to the Indianapolis Indians of the Triple-A of the International League.

[7] Mercer recorded his first MLB hit off Cincinnati Reds pitcher Johnny Cueto on May 30, 2012.

[8] On May 3, 2013, Mercer was called up from Indianapolis and led the Pirates to a 3–1 victory over the Washington Nationals with a two-run home run.

[15] On July 19, 2015, Mercer suffered a leg contusion and sprained medial collateral ligament after being slid into at second base by Brewers outfielder Carlos Gómez.

[19] He was recalled on April 30, but went back on the injured list May 8 and did not return to major league action until July 1.

On January 30, 2020, the Tigers signed Mercer to a minor-league contract with an invitation to spring training.

[25] On February 5, 2021, Mercer signed a minor league contract with the Washington Nationals organization.