SAN FRANCISCO -- If you are on his 25-man roster, Kirk Gibson is not going to hesitate to put you in the starting lineup.

Case in point is the lineup the D-backs manager ran out for Wednesday afternoon's series finale in the first-place showdown with the Giants at AT&T Park.

Gone were regulars Gerardo Parra in left, Kelly Johnson at second and Miguel Montero behind the plate. In their place were rookie Collin Cowgill, Cody Ransom (playing third with Ryan Roberts shifting to second) and Henry Blanco.

"We have a team with 25 guys on it," Gibson said. "I want these guys to play, they're excited to play, and beyond that, I just like my lineup. I want them all to be engaged. I want them all to experience what we're going through and have a chance to succeed."

Upton amazes with highlight-reel catch

SAN FRANCISCO -- It was a great catch that almost wasn't.

With the D-backs clinging to a 2-1 lead against the Giants on Tuesday night, San Francisco had a runner on first with one out when Carlos Beltran crushed a ball to right. Upton, running at full speed, jumped and extended fully to snare the ball on the track before bracing himself as he hit the wall. He then whirled and fired to first to double off Jeff Keppinger and end the Giants' threat.

"I didn't think he'd get to that ball, but he did and he killed the rally," Giants manager Bruce Bochy said.

Turns out, Upton surprised himself with the catch.

"I didn't think I was going to get to it," Upton said. "I was just trying to get over there and attempt to make a play on it. Off the bat, though, I got a pretty good jump on it, stretched out and it went in my glove."

Playing right field at AT&T Park with its brick and chain-link fence in addition to a gap that stretches to 421 feet is a challenge.

"It's not easy," Upton said. "You kind of try to play the gap and not allow the extra-base hits."

Collmenter back in rotation, to face Dodgers

SAN FRANCISCO -- It looks like D-backs right-hander Josh Collmenter will start Friday against the Dodgers.

Manager Kirk Gibson had said over the weekend that with Thursday's off-day and the insertion of Jason Marquis into the rotation, Collmenter's turn would be skipped this time around. After thinking about it some more, though, he decided to reverse course.

That means it will be Collmenter, Joe Saunders and Ian Kennedy in the three-game series with the Dodgers.

"It gives these other guys a day as well," Gibson said, referring to the rest of the rotation. "We've asked a lot of them so we're just kind of looking out the rest of the month and the season. It just can't hurt."

D-backs starters are second to the Phillies in the National League in innings pitched. With another off-day coming up on Aug. 15, the D-backs will once again have the opportunity to either skip a starter or give everyone another extra day.