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5/18/2013 7:00 P.M. ET

Cubs looking to eliminate defensive lapses

CHICAGO -- The Cubs made another error in Saturday's 8-2 win over the Mets at Wrigley Field, upping their season total to 34, the second-most in the Major Leagues.

Saturday's miscue -- when shortstop Starlin Castro booted a routine double-play grounder in the top of the second -- followed a two-error performance in Friday's loss to New York.

One of Friday's mistakes was a simple lack of miscommunication, when first baseman Anthony Rizzo and catcher Welington Castillo ran into one another on a ninth-inning popup in foul territory.

Fortunately for the Cubs, the miscue -- charged to Rizzo -- didn't change the outcome of the game. But players and fans got a reminder on Friday night about how silly mistakes can directly affect the game's outcome, when the Astros lost to the Pirates. Houston's second baseman and left fielder ran into each other while going for a popup with two outs and the bases loaded in the bottom of the ninth inning, leading to a walk-off win for Pittsburgh.

"Those are things that, you saw last night in the Pirates' game, it's unfortunate sometimes things happen," Cubs manager Dale Sveum said. "We did call the other ball when [left-hander Travis Wood] was pitching, and it was a ball you shouldn't have called and yesterday we had one. Luckily, that one didn't hurt us, but it cost our pitcher a few more pitches.

"Those are the things you worry about. But you have to call the ball so somebody knows. You have to call it, and call it loud."

While the Cubs overall are struggling -- their 34 errors have led to 20 unearned runs, fifth-most in the Majors -- second baseman Darwin Barney continues to do his thing. The 2012 Rawlings Gold Glove Award winner was out early on Saturday taking grounders.

"Gold Glovers I've been around in the big leagues that have already won their Gold Gloves stick to their routine and seem to still work harder than anybody else," Sveum said.

Garza slated to return on Tuesday

CHICAGO -- Right-hander Matt Garza will return to the Cubs' rotation on Tuesday in Pittsburgh and make his first Major League start since last July.

"I'm excited and just happy that I don't have to rehab again," said Garza, who opened the season on the disabled list with a strained left lat. "This actually means something, and I can't wait. It's been 10 months in the making, so I'm excited to get back out there."

Garza won't be activated until before Tuesday's game, when a corresponding move will be announced. But the domino effect of Garza's return to the rotation is already known -- right-hander Carlos Villanueva will shift to the bullpen.

Garza made four rehab-assignment appearances, the last of which came on Thursday at Triple-A Iowa, when he allowed two hits and struck out six over six scoreless innings. Manager Dale Sveum said that outing was enough to show the Cubs that Garza was ready to return.

"We've slowed it up a little bit and he did everything -- and then his final one was as good as it could be," Sveum said. "It was just time to get him back."

Garza said he was confident his last rehab outing proved he was ready.

"I think when they told me, 'Go get six,' and I threw six, it was enough lobbying that I can actually argue," Garza said when asked if he had to persuade the Cubs to let him return. "I was excited, and I'm just ready to do my part."

Garza won't immediately be fully unleashed. Sveum said the right-hander will be held to 85-90 pitches.

As for Villanueva, it's back to the bullpen -- where he has spent most of his eight-year career. Outside of his last start on Tuesday -- allowing seven runs on 12 hits in five innings against Colorado -- he's been one of Chicago's best starters, going 1-3 with a 3.93 ERA in eight starts, five of which have been quality outings.

Right-hander Scott Feldman, who started Saturday against the Mets, will remain in the rotation after going 3-0 with a 1.57 ERA in his last four starts. Sveum said it wasn't a competition between the two, instead pointing to Villanueva's history in the 'pen.

"Obviously, he's built up to do a lot of things," said Sveum, adding that Villanueva will pitch in a variety of roles.

For Garza, Tuesday's start marks the end of a long journey. He left his start against the Cardinals last July 21 with a cramped right triceps, and one month later was placed on the 60-day disabled list with a stress reaction in his right elbow.

He then strained his lat during a live batting-practice session in Spring Training.

In all, it was the longest the 29-year-old said he's ever been away from the game. He's definitely ready to be back.

"The mental part was the tough part," Garza said. "It was one setback after another, and it was, 'Keep going, keep going, keep going.' I'm just happy I'm here at the end of it, and can't wait 'til Tuesday."

Worth noting

• After Saturday's game, Rizzo has not struck out in his last 39 at-bats, the longest active streak in the Majors.

• The Cubs have lost 12 games in which they led at some point, tied with the D-backs and Dodgers for most in the National League.

• No. 3 prospect Jorge Soler went 7-for-10 with a double, solo home run and four runs scored as Class A Advanced Daytona swept a doubleheader against Lakeland on Friday.

Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.