© 2010 MLB Advanced Media, L.P. All rights reserved.

07/31/10 2:41 AM ET

Rockies, Cubs square off on Deadline day

Even with Friday's return of Carlos Zambrano, Tom Gorzelanny will remain in the Cubs starting rotation for the time being. Given Gorzelanny's success in Zambrano's stead, it's easy to see why. In five starts since replacing Big Z, Gorzelanny is 4-0 with a 2.83 ERA.

In his latest outing on July 24 against the Cardinals, Gorzelanny allowed three earned runs over six innings, drawing praise from his manager Lou Piniella.

"There's no reason this young man can't hold down a rotation spot in a Major League rotation for this organization and pitch well," Piniella said. "He's young and he's durable, and he's got the pitches. It's just a question of having the confidence, and I think you're seeing the confidence manifest himself."

Zambrano was embraced by his teammates upon returning for the first time since his tirade on June 25 and will be used out of the bullpen for now.

"I'm a starting pitcher," Zambrano said. "I don't want to be in the bullpen. Obviously, if they decide to put me in the bullpen, I accept it."

After riding high for six weeks, Colorado right-hander Jason Hammel has fallen back to earth over his past three starts.

From May 27 to July 10, Hammel went 6-0 with a 2.17 ERA. In his three outings since, Hammel is 0-3 with a 5.49 ERA. On Monday at Philadelphia, Hammel was stung by poor defense en route to giving up five runs (four earned) over 5 2/3 innings of work.

"I was trying to do a little too much," Hammel said.

Cubs: Howry released, likely to retire
In order to make room for Zambrano, the Cubs released reliever Bob Howry on Friday. Howry went 1-3 with a 7.71 ERA in 38 games combined with the Cubs and D-backs this season. The 36-year old went 0-3 with a 5.66 in 24 appearances for Chicago.

"That was a little hard on me because he's such a classy, classy young man," Piniella said of the 13-year veteran. "We've made a commitment to our young pitchers here. I think Bob is going to retire -- that's the indication I had."

Rockies: Helton begins rehab assignment
Todd Helton, who hasn't played for the Rockies since July 4 due to back stiffness, started his rehab assignment on Friday, going 0-for-2 with a walk and an RBI as a designated hitter for Rookie-level Casper.

Worth noting
Bench coach Alan Trammell will serve as the Cubs manager for three games starting Saturday, as Piniella will be in Florida for the funeral of his uncle Joseph Magadan, father of Red Sox hitting coach Dave Magadan.

This story was not subject to the approval of Major League Baseball or its clubs.