The Chicago Cubs optioned right-handed pitcher Kevin Hart to Triple-A Iowa, effective Wednesday.
The team will make a corresponding move prior to Friday's game against the St. Louis Cardinals.
The Cubs also activated left-handed pitcher Jason Waddell from the 15-day disabled list and optioned him to Triple-A Iowa.
Hart was solid in first major-league start Wednesday, allowing one run on four hits in five innings. He also struck out three and walked five in a 4-1 loss to the Atlanta Braves.