Matthew Gerrit den Dekker (born August 10, 1987) is an American baseball coach and former outfielder, who is the minor league baserunning and outfielding coach for the New York Mets. He played college baseball at Florida for coach Kevin O'Sullivan from 2007 to 2010 and played in Major League Baseball (MLB) for 6 seasons from 2013 to 2018 for the Washington Nationals, Detroit Tigers and New York Mets.