PHILADELPHIA -- For Welington Castillo, it was literally a wake-up call.

Triple-A Iowa had been rained out Friday night, so the Cubs' catcher was at home taking a nap when the phone rang.

"They said, 'You're going to Philadelphia.' I was really surprised," the 25-year-old said. "I asked what happened."

What happened was that catcher Steve Clevenger had been placed on the disabled list with a strained left oblique. And since starting backstop Geovany Soto has also been experiencing mild tightness in his upper back, Castillo started his second straight game against the Phillies on Sunday at Citizens Bank Park.

The Cubs have a lot of catching depth right now, so Castillo, who was hitting .320 with four doubles, two homers and eight RBIs in 16 games at Iowa, is looking at this as an opportunity to show what he can do.

"You can't take anything for granted. So, every time you get the chance, you got to do your best to show that you can play at this level," he said.

Castillo is 0-for-7 since being called up, including an 0-for-4 day in Sunday's 5-1 win.

Sveum close to pulling Marmol in hairy ninth

PHILADELPHIA -- Cubs closer Carlos Marmol came in to mop up things against the Phillies on Sunday. It was supposed to be a formality, but he made it a lot more exciting than manager Dale Sveum would have preferred.

Two walks and an infield single loaded the bases with two out, then Marmol walked in the only run the Phillies scored in Chicago's 5-1 win at Citizens Bank Park. That brought Shane Victorino to the plate as the potential tying run. He grounded out to end the game.

Asked how close he came to pulling Marmol, Sveum smiled.

"Well, Victorino was his last hitter, if that's what you're asking," the skipper said. "And it might not have been Victorino if I didn't have flashbacks of the '08 playoffs when Victorino hit a grand slam off CC [Sabathia]. I was like, 'Ah, I don't think I want a left-hander in there to face him.'"

Sveum referenced the 2008 National League Division Series during which he managed the Brewers.

The manager indicated that he understands that you have to accept outings like this with Marmol.

"He's going to be a high pitch-count guy. Most times he's going to be 20 or 30 pitches," Sveum said. "Obviously, you don't want to see that kind of stress out there. But that's what he is and that's what you have to understand. You've got to be patient, but there's only so much you be patient with."

Wells' fate likely to be decided on Thursday

PHILADELPHIA -- The Cubs probably won't decide whether Randy Wells will be moved to the bullpen or sent back to Triple-A Iowa until Thursday, when Ryan Dempster (strained right quad) is able to make his scheduled start at Cincinnati.

Manager Dale Sveum added, however, that Wells should be ready to pitch out of the bullpen in the meantime.

"He'd be available by Tuesday, probably, in some capacity," Sveum said.

Wells pitched well for three innings Saturday night, not allowing a hit through the first three innings, before three walks in the fourth proved costly.

"That was an unfortunate outing," Sveum said. "For whatever reason, pitchers sometimes lose their release point. And it wasn't like he was barely missing, either. There were a lot of 55-footers. It could have been ugly, really. [Catcher Welington] Castillo did a good job of blocking a lot of really bad pitches."

Worth noting

• Jeff Baker and Joe Mather started at the corner outfield spots on Sunday, as manager Dale Sveum rested David DeJesus and Alfonso Soriano. And both backups contributed. Baker had a double, a single and two RBIs. Mather had a walk and a solo homer.

"Those guys did a great job," Sveum said.

Mather's homer was just the eighth of the year for the Cubs and the first by an outfielder.

"I don't know what the record is, but we were probably closing in on it, in the modern era, anyway," Sveum joked.

• Bryan LaHair tied his career high with three hits in Sunday's 5-1 win over the Phillies. He's reached base safely in a team-leading 18 straight games.

• The Cubs announced that Minor league infielder Edgar Gonzalez, 33, has been granted his release to pursue opportunities in Asia. The brother of Red Sox first baseman Adrian Gonzalez was hitting .286 in nine games at Triple-A Iowa.