Extra bases

• Scott Feldman, bothered by tightness in his back, will take advantage of Monday's off-day and be skipped one turn in the Cubs rotation.

Feldman was originally scheduled to start Wednesday against his former team, the Rangers, in the second game of an Interleague series, but now will not start until Saturday when the Cubs are playing the Brewers at Miller Park.

The Cubs' rotation against the Rangers now will be Travis Wood, Carlos Villanueva and Jeff Samardzija.

• Second baseman Darwin Barney flew to Des Moines on Saturday to begin a Minor League rehab assignment. Barney, out since March 30 with a left knee laceration, was expected to play Saturday, Sunday and Monday for the Triple-A Iowa team, and rejoin Chicago on Tuesday. Barney was injured sliding into the right-field wall at Minute Maid Park on March 30.

• Third baseman Ian Stewart was also headed to Iowa on Saturday and will begin a rehab assignment on Sunday. He did not play in any Cactus League games because of a strained left quad, which he injured in the first intrasquad game on Feb. 21.

• Scott Baker, who is still rehabbing from Tommy John surgery, which he had one year ago, was in Chicago to be re-examined by team orthopedic specialist Dr. Stephen Gryzlo. Baker has been training at the Cubs' facility in Mesa, Ariz. There's no timetable for his return.

• Steve Clevenger could start at third base Sunday in the Cubs' series finale against the Giants. Clevenger made his first start on Friday, and cleanly handled the balls hit to him. He made the Cubs' Opening Day roster last year as a backup catcher.

"I'll put Clevenger at third again [Sunday] and see what happens," Cubs manager Dale Sveum said. "He can swing the bat. He gives you that left-handed bat that changes the way a pitcher pitches, and gets pitch counts up."

Clevenger was a middle infielder before he was converted to catcher in the Cubs' Minor League system.

• Giants manager Bruce Bochy presented Nate Schierholtz with his 2012 World Series ring while San Francisco was taking batting practice on Saturday. Schierholtz came up in the Giants organization, winning a ring in 2010. He was with the Giants until July 31, when he was dealt to the Phillies for Hunter Pence.

Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.