He was an outfielder who threw and batted right-handed, stood 5 feet 10 inches (1.78 m) tall and weighed 160 pounds (73 kg).
During his career, he had two separate trials in Major League Baseball with the 1962–1963 Athletics, appearing in seven games played, and making four hits in 15 at bats.
[1] In the former season, Martínez batted .310 and was named the second baseman of the Sophomore League's all-star team.
He made one Major League appearance at the tail end of the 1962 campaign, striking out as a pinch hitter on September 30.
In 1963, he had a six-game May–June tenure with the Athletics, hitting a home run off Ken McBride in his second MLB at bat on May 24.