In 1999 Bergeron split time with the Ottawa Lynx and Harrisburg Senators. In a total of 100 games for the two teams he would hit a combined .320 with 23 stolen bases as a leadoff hitter. Bergeron made his Major League Baseball debut with the Montreal Expos on September 7, . 2000 was Bergeron's only full season in the majors. He served as the regular leadoff hitter for the Expos and hit .245 with 5 home runs, 31 RBI and 11 stolen bases in 148 games played. He also led the National League with 16 outfield assists.