 Mouton was drafted by the Astros in the 7th round of the 1991 Major League Baseball Draft as a second baseman.He advanced rapidly through their farm system, and was already playing at Triple-A with the Tucson Toros in 1993.That year, he won the Pacific Coast League Most Valuable Player award after batting .315 with 16 home runs, 92 RBI, and 40 stolen bases.