Justin Scott Grimm (born August 16, 1988) is an American former professional baseball pitcher.

He played in Major League Baseball (MLB) for the Texas Rangers, Chicago Cubs, Kansas City Royals, Seattle Mariners, Milwaukee Brewers and Oakland Athletics.

During April, Grimm held a 2–0 record with a 1.59 ERA in 3 starts, striking out 15 and holding opponents to a .239 batting average in 17.0 innings.

[10] The Rangers traded Grimm to the Chicago Cubs on July 22, 2013, with Mike Olt, C. J. Edwards, and Neil Ramirez, in exchange for Matt Garza.

Grimm finished the season in the Cubs' bullpen, working 9 innings and posting a 2.00 ERA.

At the end of spring training, Grimm made the Cubs' opening-day roster as a relief pitcher.

On August 29, 2014, Grimm became the 68th pitcher in Major League history to strike out four batters in a single inning.

[13] Grimm finished the 2014 season with a 5–2 record, a 3.78 ERA and 70 strikeouts over 69 innings pitched, working primarily as a middle reliever.

[16] The deal included an invitation to the Indians' 2019 major league spring training camp.

Grimm opted out of his contract on March 22, 2019, after being informed he would not make the opening day major league roster.

[citation needed] Grimm married longtime girlfriend Gina Nuccio, a former All-American gymnast at the University of Georgia, on January 30, 2016.