4-period All-Star who specific as a specified hitter and hit 306 house runs during his 21-year career. He spent his initial seven MLB periods with the Tx Rangers and in addition performed for the Oakland Athletics, NY Yankees and several other groups. He was a three-sport superstar developing up in his indigenous Puerto Rico. He led the American Group in RBIs in 1989 as an associate from the Rangers. He previously a son called Ruben, Jr. along with his wife Janette. He was exchanged for slugger Jose Canseco in August, 1992; Sierra was delivered to the Oakland Athletics and Canseco joined up with the Tx Rangers.