In 15 games with the Fort Wayne Wizards in 2006, Mark Roberts posted a 1.80 ERA over 20 innings, allowing 16 hits, walking eight and striking out 26. He was promted to the Lake Elsinore Storm on June 12, 2006.

Roberts went 1-1 with one save and a 5.01 ERA over 27 appearances with the Lake Elsinore Storm. In 32.1 innings he allowed 30 hits, walked 11 and struck out 27. The opposition hit .250 off him with four homers.