Colegio de Belén
Martinez graduated from Belen Jesuit Preparatory School in Miami, Florida, and enrolled at Fordham University. He is the 34th Fordham alumnus to make it to the Major League Baseball (MLB). He was 1-3 with a 5.33 ERA in 15 games, over two seasons for Fordham as a relief pitcher. He was mostly a second baseman, batting .295 with 4 HR, 66 RBI, 167 hits, and 22 stolen bases over three seasons and 148 games. In 2011, he played collegiate summer baseball with the Falmouth Commodores of the Cape Cod Baseball League. He also played in the New England Collegiate Baseball League for the Vermont Mountaineers. He is the seventh Mountaineer to make it to the MLB.