De La Rosa, on the 15-day disabled list with an injured tendon band in the middle finger of this throwing hand, tossed four innings and allowed one run on four hits. He threw 72 pitches, including 48 strikes.
"I can't tell you how happy I am to hear of no issues whatsoever with the finger," Tracy said. "He had no problem in sensation or feeling in any of his pitches. He made sure everybody's aware of the fact that he got an [at-bat], and he hit a bullet."
De La Rosa struck out five batters and issued no walks.
"For the amount of time that he hasn't pitched, to go out there and not walk anybody, that's even more encouraging, knowing how hard it is to get hits off this guy," Tracy said. "If he's not going to create traffic for the opposition, you have to create for yourself. With the type of stuff he has, that makes it real hard for the opposition."
De La Rosa will throw a bullpen session with the Rockies on Friday in Anaheim before his next rehab start with Colorado Springs, scheduled for Sunday.
De La Rosa is 19-9 in the past two seasons combined and was 3-1 with a 3.91 ERA this season before being placed on the DL.