Drew Smyly is expected to pitch for South Bend in a rehab assignment on Thursday.
The Iowa Cubs swept a doubleheader from the Oklahoma City Dodgers, 1-0 and 3-2.
Trevor Clifton started game 1 and gave up just four hits over five innings. Clifton struck out five, walked one and hit one batter.
Brian Duensing pitched the next 1.2 innings in a rehab appearance. He retired all five batters he faced, striking out one.
Dillon Maples was summoned from the pen to get the final out.