Pomeranz, 23, is 4-4 with a 2.91 ERA in nine starts at Triple-A Colorado Springs, after going 0-2 with a 4.70 ERA in four early-season starts for the Rockies. Recent reports say Pomeranz has regained his delivery, as well as the fastball velocity that was slightly down when the season began.
Chatwood, 22, a right-hander, was called up before Friday's game, and gave up two runs and five hits in one inning plus three batters. At first, the Padres jumped on early pitches. Carlos Quentin, the first batter Chatwood faced, homered on a 1-0 pitch. As the outing progressed, Chatwood missed with early pitches and then was hit. A 6-0 lead became a 6-2 lead, but Rex Brothers replaced Chatwood to end the Padres' rally in the eighth, and the Rockies ended up winning, 10-2.
Chatwood began the year in the Rockies' bullpen, but was sent to Colorado Springs to work as a starter, to build his pitch count and work on delivery flaws.
"I saw a guy that was trying to do a better job of separating his hands sooner, which is a good thing because it keeps him over the rubber and keeps him behind the ball," Tracy said. "I also saw some things that he can gravitate toward and continue to learn from.
"After it went from 2-0 to 6-0, the intention was to give this kid the ball and let him finish [the game]. That would have been the best-case scenario: have him pitch three strong innings and finish out the game. He's got to be more efficient in the strike zone, as do all of our young guys."
The Rockies have been using Jeremy Guthrie, Guillermo Moscoso and Josh Roenicke as backups to starting pitchers in their four-man rotation, so they would be covered in the bullpen if they were to send down Chatwood to make room for Pomeranz.