Casey Patrick Kelly (born October 4, 1989) is an American professional baseball pitcher for the LG Twins of the KBO League.
He was a first-round draft choice, 30th overall, in the 2008 Major League Baseball Draft by the Boston Red Sox.
Kelly was the top minor league prospect in the Red Sox organization when he was acquired by the San Diego Padres after the 2010 season, along with three other prospects, in exchange for All-Star player Adrián González.
He made his Major League Baseball (MLB) debut with San Diego in 2012, but underwent Tommy John surgery the following year.
Kelly was traded to the Atlanta Braves after the 2015 season.