Chatwood was the Angels' Minor League Pitcher of the Year for 2010, going a combined 13-9 with a 2.84 ERA in 155 1/3 innings at three stops -- from advanced Class A Rancho Cucamonga through Double-A Arkansas to Triple-A Salt Lake.
A 6-foot, 185-pound right-hander who calls to mind Roy Oswalt, Chatwood hits the mid-90s -- touching 98 mph -- with a big curveball.
"When I came up, I was compared to Oswalt," Chatwood said. "I watched him; he's nasty. I've pretty much got my own style and delivery. I'm trying to refine some things, work on what I took from last year."
He showed his big time stuff against the Reds on Tuesday, setting down six of the seven hitters he faced. A hit batsman was the only blemish in an otherwise perfect two innings, with one strikeout.
"Chatwood really looked good," said Angels manager Mike Scioscia, who sees the local kid climbing the depth chart.
Chatwood, who turned 21 on Dec. 16, is a native of Fontana, Calif., and attended Redlands East Valley High School. He was the Angels' top choice in the 2008 First-Year Player Draft, taken in the second round at No. 74 overall.
"I was a shortstop my senior year," Chatwood said. "I only threw like 30 innings. I'm pretty much learning how to pitch, how to read hitters. I've got to catch up."
Clearly moving quickly, he has climbed to No. 76 on Baseball America's list of its Top 100 Major League prospects.