There are others that played minor league ball in addition to the names on this list. Michael Jordan played in the middle of his retirement from basketball. Others like Garth Brooks and Billy Crystal played for teams during spring training.
Danny Ainge was an All-American in Baseball, Basketball, and baseball coming out of BYU and made it all the way to the big leagues after being drafted by the Toronto Blue Jays in the 15th round in 1977. The infielder was playing in Toronto by 1979, and hit .220 in 211 games over the next three years before taking his talents to the hardwood.