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6/5/2013 7:45 P.M. ET

A's gearing up for lefty pitching in Chicago

MILWAUKEE -- A's manager Bob Melvin barely tweaked his lineup during his club's three-day stay in Milwaukee. That could also prove to be the case for four games in Chicago beginning Thursday.

Having faced three Brewers right-handers in a row, Melvin stuck with nearly the identical lineup each game, save for Seth Smith getting a start in right field on Wednesday while Josh Reddick enjoyed his first day off since returning from the disabled list. Smith went 0-for-2 in the 6-1 win over the Brewers before he was lifted for a pinch-hitter.

Come Thursday, it'll be the right-handed hitters getting the bulk of playing time, with the White Sox set to throw at least three lefties at them -- possibly four, with righty Jake Peavy going on the disabled list.

That means Derek Norris, who sat for the third straight game on Wednesday, could be behind the plate for all four White Sox games.

"I typically don't do that, have one of them catch a day game after a night game, but we're going to try to maximize our matchups, knowing it could be four left-handers there," Melvin said.

The A's have done very well against southpaws this season, batting .264 against them, compared to .243 vs. right-handers, entering Wednesday.

Then there's Nate Freiman, who has simply dominated them. Oakland's first baseman is 18-for-53 (.340) against left-handers and just 1-for-18 when a right-hander is on the mound. So he'll rack up plenty playing time this weekend, though Melvin also plans on getting his counterpart, Brandon Moss, a few at-bats against lefties, too.

Moss entered the day batting .125 with 28 strikeouts over his last 25 games. But he hit a game-breaking homer off lefty reliever Mike Gonzalez on Wednesday, his first hit against a lefty since May 11.

"[Moss] will be getting some at-bats against left-handers," Melvin said. "He's going to get hot again. There's no doubt about it. His batting practices are better. He hit a home run here the other night. So there will be times he'll get some at-bats against lefties, but based on the fact Freiman has done well against left-handed pitching, he's going to get the brunt of the at-bats."

Doolittle to remain setup man despite recent troubles

MILWAUKEE -- On the same morning Sean Doolittle identified a small mechanical problem that may be contributing to his recent struggles, his manager gave him a vote of confidence and said he has no plans to remove the lefty from his setup role.

Bob Melvin said he spoke with Doolittle on Wednesday morning, not much more than 12 hours after the second-year reliever gave up three runs on only four pitches in the eighth inning, allowing the Brewers to tie a game they would eventually win in the 10th inning. It was the third straight outing Doolittle had allowed at least two runs, the same number he surrendered total in his first 23 appearances.

"I don't know that we avoid him today or want to," Melvin said. "He feels good, we still feel good about him. You're constantly looking to make adjustments when you have tough periods, and he will, and he has. I'm sticking with him.

"Like any pitcher that's ever pitched, you're never going to be perfect over the course of your entire career, and I think going through something like this gives you experience, makes you better, makes you find out different ways to do it. He'll be better on the flip side for it."

Doolittle believes he has already bettered himself, as he watched video of his recent outings early Wednesday morning that showed mechanics that "weren't even the same two weeks ago," he said.

"I'm flying open just a touch," said Doolittle, who didn't pitch in Wednesday's 6-1 win over the Brewers. "My hips were coming open a little bit too soon, and I think I was showing them the ball a little bit too early and it was taking away some of the life that I have on my fastball, because I wasn't staying behind it as long. So we did some mechanic work this morning, felt really good throwing, so I feel really confident if I get in there today.

"Any time you can identify the problem, especially to have it be a relatively easy fix, that's big."

It's mostly a relief for the 26-year-old converted first baseman, who took up pitching after injuries derailed his career as an infielder less than two years ago. Just as important is the trust he's been awarded by Melvin, whose decision to stick with Doolittle proved rather easy.

"You take into consideration what kind of guy he is," Melvin said. "Is he a confident guy? Is he someone you need to give a break to? He's not that type of guy. He wants the ball and he wants it today."

"That's always really reassuring," Doolittle said. "I think my track record up to this point has been pretty good, but it still kind of reinforces the confidence you have in yourself when your manager backs you like that. I really appreciate it."

Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.