Mario Miguel Guerrero Abud (born September 28, 1949) is a former Major League Baseball shortstop who played for four teams in an eight-year career from 1973 to 1980.
Guerrero signed with the New York Yankees as an amateur free agent in 1968. After four plus seasons in their farm system, he was sent to the Boston Red Sox on June 30, 1972 as the player to be named later in the deal that brought future Cy Young Award winner Sparky Lyle to the Yankees. Guerrero made the BoSox out of spring training 1973, and won the starting shortstop job over Rick Burleson the following Spring following Luis Aparicio's retirement.
During the off season, Guerrero was traded to the St. Louis Cardinals for pitcher Jim Willoughby. He split 1975 between the Cards and their triple A affiliate, the Tulsa Oilers, batting .239 in 64 games at the major league level. He was assigned to Tulsa in 1976 when he was traded to the California Angels for two minor leaguers.
He signed as a free agent with the San Francisco Giants after the 1977 season only to be packaged in a trade to the Oakland Athletics for Vida Blue during spring training 1978. He played three seasons in Oakland before his contract was purchased by the Seattle Mariners. He retired following his release from the M's in spring training 1981. In 1989, Guerrero played for the Winter Haven Super Sox of the Senior Professional Baseball Association. He batted .315 in 15 games.
His brother Epy Guerrero was a coach for the Toronto Blue Jays. While working as a buscón (headhunter) in the Dominican Republic, Guerrero sued Raúl Mondesí for 1% of his salary. He ended up winning a $640,000 judgment.
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