Fulmer will serve as the Cubs' opener Saturday versus the Cardinals, Tony Andracki of Marquee Sports Network reports.
Fulmer threw 15 pitches in relief for the Cubs during Friday's 4-3 win over St. Louis, so he'll probably only cover the first inning of Saturday's tilt. The 30-year-old right-hander holds a 4.43 ERA, 1.29 WHIP and 46:21 K:BB through 42.2 frames on the season.