He played in Major League Baseball (MLB) for the Milwaukee Brewers, Colorado Rockies, Boston Red Sox, San Diego Padres, and New York Mets.

Tatum also played in Nippon Professional Baseball (NPB) for the Yakult Swallows and in the KBO League for the LG Twins.

[2] After being released by the Indians, Tatum signed with the Milwaukee Brewers in 1990, and made his MLB debut with them in 1992, appearing in five games.

[2] In 1997, Tatum signed with the Yakult Swallows of Nippon Professional Baseball (NPB), and appeared in 51 games, hitting .309 with 13 home runs and 25 RBI.

[2] After spending the 1999 season with the Rockies organization, Tatum played in the minors for the San Francisco Giants in 2000, before joining the LG Twins of the KBO League for 20 games.