In 2008, Martínez competed in the Spanish National Athletics Championship where he finished first in the 800 and 1500 meters. That winter, he finished first at the Spanish national winter cross country championships. The following year at the Spanish National Athletics Championship, he competed in the 400, 800, 1,500, long jump and 4x100 meter events, where and came first in the 800 and 1500 meters. . He competed at the 2008 World Intellectual Disability Indoor Athletics Championships in Tallinn, Estonia in where he finished second in the 400 meter event and third in the 4x400 meter event. Competing at the 2008 European Championships, he finished first in the 400 meters. Competing in the 2009 Subida al Castillo de Chiva, he came in first in the one mile Paralympic class with a time of 4:45. He competed in the 2009 World Games in the Czech Republic. He competed in the 2009 Spanish national cross country championships, where he finished first. The next year, he finished third.