In five games, including one start, during Spring Training, the 22-year-old Chapman had a 1.69 ERA. Over his 12 2/3 innings, he walked seven and struck out 15. His chances to earn a spot in the big league rotation were hampered by back spasms on March 22. He has since pitched without any issue.
In Sunday's start, Chapman will be limited to 75-85 pitches.
Speaking of Louisville, the Bats have a pretty formidable five-man rotation this season. After Thursday starter Sam LeCure, it has 2009 Reds Minor League Pitcher of the Year Travis Wood, Matt Maloney, Justin Lehr and Chapman.