Raley, who became the 15th Cubs rookie to play this season, and the eighth to make his debut, will get a chance to stick now that Matt Garza has been placed on the 15-day disabled list, retroactive to July 28, with right elbow stress reaction.
"I think he'll get a few starts," manager Dale Sveum said. "I don't think you add a guy to the roster just for a one-game audition. He's a guy that can do certain things with a baseball, a four-pitch guy, that you've got to give a look the last seven weeks of the season."
Teammate Jeff Beliveau, who has played with Raley the last three years in the Cubs' system, called him "super-athletic" on the mound.
"He makes some crazy plays," Beliveau said. "He can swing the bat a little bit, and a good runner — not (Tony) Campana speed, but pretty fast. Guys like playing behind him because he works quick, gets ground balls, throw strikes. I was calming his nerves a little today because I knew my first two times I was a little jittery. (It's) tough to repeat (your delivery)."
Sveum had a long talk with Raley in the dugout three hours before the game, telling him to relax and be himself.
"Any guy, for the first time, I don't care what you say to them, the first inning, their legs are going to feel (shaky)," Sveum said. "Hopefully it's the last time you ever feel like that, but that's what happens.
"He's a pretty poised kid that can make things happen. Hopefully he's just keeping the ball down. We've all been impressed with him. That's why he's here."
Sveum said Raley's changeup is his best pitch, and he would be able to throw 90-95 pitches in his first outing.
Soriano watch: Alfonso Soriano was scratched from Tuesday's lineup with a swollen right index finger, with David DeJesus moving to left and Bryan LaHair being inserted in right.
Soriano said he was accidentally spiked during a slide into second base Monday night, and the finger was still swollen Tuesday.
"I can't be Superman," he said, adding he expected to be back on Wednesday for the series finale.
Extra innings: Arodys Vizcaino, one of the pitching prospects acquired from the Braves in the Paul Maholm-Reed Johnson trade, was with the club in San Diego. Vizcaino is rehabbing from Tommy John surgery, and the Cubs wanted him to get together with trainer Mark O'Neal and pitching coach Chris Bosio to get on a schedule. Sveum said Vizcaino is throwing on flat ground. He'll vie for a rotation spot next spring. … The Cubs already have used 46 players this year, five shy of the club record, set in 2000. Fifteen of the 25 current players are new to the Cubs this year, and only six remain from the 2011 opening-day roster now that Garza is on the disabled list.