Matters on the constant lapses over health insurance, and weight increase tolerance in the tracks (to just name a few). Martinez alongside other professional riders were interviewed for an HBO documentary "Jockey: America Undercover", series back in 2004 for their opinion on the sport and its tolerance in supporting unhealthy lifestyles for jockeys to benefit horses performances during a race. Martinez is best known as the jockey of Brass Hat which his big break came in 2006. He rode the gelding to victory in several important Graded stakes races, including the Grade 1 Donn Handicap, and on July 8, 2007 broke a 36-year-old track record for 1 1/16 miles at Churchill Downs, stopping the clock at 1:41.27. He also rode Brass Hat to a second-place finish in the Dubai World Cup, although the horse was later disqualified for a medication violation. Martinez logged several graded stakes victories aboard Trinniberg in 2012, including the Woody Stephens Stakes, Swale Stakes, and the Breeders' Cup Sprint. Trinniberg went on to win the Eclipse Award for male sprinter that year. On May 1, 2010, Martinez rode Noble's Promise to a 5th-place finish in the Kentucky Derby.