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5/19/2013 12:40 P.M. ET

Adjustments help C. Johnson hit well against lefties

ATLANTA -- When the Braves entered this season with the plan to platoon the right-handed hitting Chris Johnson and left-handed hitting Juan Francisco at third base, the concern was that most of Johnson's previous success had come against right-handed pitchers.

But with the help of Braves hitting coach Greg Walker, Johnson has altered his approach against left-handed pitchers and found immediate success. With the three hits he recorded against Dodgers southpaw Chris Capuano in Saturday night's victory, Johnson entered Sunday leading the Majors with a .435 (20-for-46) batting average against left-handed pitchers. He has hit .275 (19-for-69) against right-handed pitchers.

"There's a couple things I've had trouble against lefties with, and I've just been trying to eliminate that and not even worry about that," Johnson said. "It's been working. I've just got to continue focusing on going up the middle and going the other way."

Johnson entered this season having hit .283 (254-for-896) against right-handed pitchers and .255 (85-for-333) against left-handed pitchers.

"I think I used to just feel more comfortable with lefties out there, rather than having to face a tough righty," Johnson said. "I'd be like, 'Oh, I feel so good, I'm going to homer off this guy.' Then the next thing you know, I'm 0-for-4."

Still improving, Medlen looks to decrease walk totals

ATLANTA -- Kris Medlen certainly had reason to be encouraged after limiting the Dodgers to two hits and one unearned run in seven innings of Saturday night's 3-1 win at Turner Field. But the Braves right-hander was frustrated that he issued three walks.

"That adds more pitches to my pitch count," Medlen said. "I could have gone eight [innings] and handed the ball off to Craig [Kimbrel]. It's just frustrating. But the good news is I don't feel as good as I should. I felt good last night, but my delivery didn't feel as consistent I want it to."

Medlen has struggled to find comfort while battling mechanical issues that started to become a problem during Spring Training. His competitive nature and determination has helped him record a respectable 3.02 ERA through his first nine starts. But he certainly has not been the same as he was when he posted a 0.97 ERA in the 12 starts he made last year.

"I think I set the bar pretty high for others," Medlen said. "But I also feel like I set the bar pretty high for myself. I want to be what I was last year every single time out. I'm not necessarily there yet. But I hope everything starts clicking and I can get back to just being more consistent with walks. I'd rather give up a line drive off the wall rather than walk guys."

The 22 walks Medlen has issued in his first 56 2/3 innings this year is one shy of the total he issued in 138 innings last year. During the 83 2/3 innings he threw as a starter last year, he issued only 10 walks, drawing comparisons to Greg Maddux, who was a master of pinpoint control.

Medlen has provided some signs of encouragement while working at least seven innings in three of his four starts this month. His worst start during this span came when he surrendered three home runs and issued five walks in only 5 1/3 innings against the Giants last weekend.

Consistently missing up in the zone during that outing, Medlen was frustrated by the fact he had felt so comfortable just five days earlier in Cincinnati. After showing better command in Saturday's outing against the Dodgers, he is simply looking to find more consistency through the remainder of this season.

"I just need to clean it up a little bit," Medlen said.

Worth noting

• Because Triple-A Gwinnett's game against Louisville was postponed by rain Sunday, Brandon Beachy will have to wait a few more days to officially begin his Minor League rehab assignment. To stay on schedule, Beachy completed a three-inning simulated game in the indoor batting cage at Coolray Field. He is scheduled to throw four innings Friday, when Gwinnett hosts Toledo.

Mark Bowman is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.