4–6 record with a 3.14 ERA in 19 total starts. Because of his success in the 2009 season, he was named the 48th best prospect in the major leagues in the MLB.com Midseason Top 50 Prospect list. After the 2009 season, the Mets assigned him to the Surprise Rafters of the Arizona Fall League, where he posted a 12.56 ERA in six starts. In February 2010, Mejía was ranked as the 56th best prospect in all of baseball by Baseball America. New York Mets 2010 Mejía made the Mets 2010 opening day roster as a relief pitcher, at only 20 years old, making him the youngest Met to make an opening day roster since Dwight Gooden. He made his major league debut on April 7, 2010. After posting a 2.60 ERA in 30 relief appearances, on June 20, 2010, Mejía was optioned to Double-A Binghamton to become a starter, with Bobby Parnell taking his spot in the Mets bullpen. Mejía was recalled from Triple-A Buffalo on September 1. On September 4, Mejía made his first major league start for the Mets at Wrigley Field against the Chicago Cubs. Mike Nickeas, who caught Mejía, also made his debut in the majors on the same day. 2011–2012 After starting five games for the Mets' Triple-A affiliate in Buffalo, on April 29, 2011, Mejía left the game after four innings due to elbow discomfort. He was diagnosed a few days later with a complete tear of his ulnar collateral ligament and required Tommy John surgery, which put him out of reach for the remainder of the 2011 season. Mejía missed much of the 2012 season due to recovery from Tommy John surgery. 2013 Mejía began the 2013 season on the 60-day disabled list. He was activated on July 26, 2013, and started the first game of a day-night doubleheader against the Washington Nationals at Nationals Park. He pitched 7 scoreless innings, giving up 7 hits, striking out 7, and walking none en route to his first win of the season. 2014 In 2014, Mejía won the Mets' fifth starter role out of spring training, beating out Daisuke Matsuzaka and John Lannan. Mejía's first start and win came on April 4 at Citi Field against the Cincinnati Reds in which he went 6 innings striking out 8 and allowing 4 hits, 1 run, and 5 walks. After struggling in seven starts, Mejía was moved