Born in Havana, Cuba, Martínez was nicknamed Marty by fans and teammates. He never hit a home run in 945 major-league career at-bats, but did everything a player was asked to do. Martínez appeared at shortstop in 157 games, and also played at first (5), second (59), and third bases (74); caught (30), and made a relief appearance. Nevertheless, he is best remembered as the man who scouted and signed Edgar Martínez and Omar Vizquel, among other distinguished players.
In all or part of seven seasons, Martínez was a .243 hitter with 57 RBI and 97 runs in 436 games, including 230 hits, 19 doubles, 11 triples and seven stolen bases.
Following his major league career, Martínez played and managed for the Tulsa Drillers, Texas Rangers Double-A affiliate. He managed the Drillers in 1977 and 1978 and led the team to a Texas League first-half title in 1977. After that, he spent more than a decade in the Seattle Mariners organization as a coach on the staffs of Del Crandall, Chuck Cottier and Bill Plummer (1983–86; 1992), serving as the Mariners interim manager in the 1986 season. As a Mariners instructor, he nurtured and molded a whole generations of Seattle infielders, including the aforementioned Vizquel and Martínez, as well as Harold Reynolds and Spike Owen.
