Andrew Cashner won his Triple-A debut for Iowa on Wednesday, striking out six over six solid innings, as the Cubs shut down the Las Vegas 51s, 6-1.
The 2008 first-round pick allowed a run on five hits and a walk after going 3-1 with a 2.75 ERA in six starts at Double-A Tennessee.
Cashner put two men on base in the third inning before getting Jeremy Reed to ground into a double play. The 51st scored their lone run in the fourth on a double by Chris Aguila, but the 23-year-old right-hander stranded a runner at third by getting Kyle Phillips to ground out.
The TCU produced set down the final six batters he faced, striking out top prospect Brett Wallace and former Cubs farmhand Brian Dopirak.
Jeff Stevens yielded two hits over two scoreless innings and Blake Parker pitched a perfect ninth to seal the Cubs' third straight win.
Iowa's Micah Hoffpauir broke a 1-1 tie with a three-run homer in the sixth and Brad Snyder delivered an RBI single in the ninth.
This story was not subject to the approval of the National Association of Professional Baseball Leagues or its clubs.