ATLANTA -- The Reds hope that left-hander Aroldis Chapman won't miss a start after he had to leave in the sixth inning because of a blister on his middle finger while shutting out Lehigh Valley for Triple-A Louisville on Wednesday night.

"It's not serious," Cincinnati general manager Walt Jocketty said after checking with the Louisville trainer.

The 22-year-old allowed three hits and no runs in 5 2/3 innings, striking out seven and walking three. He threw 96 pitches, 63 of them for strikes, and picked off two runners.

Chapman (4-2) got credit for the 4-2 victory while lowering his ERA to 3.98 in eight Triple-A starts. He has 48 strikeouts and 24 walks in 40 2/3 innings.

In his previous start at Rochester, Chapman allowed eight earned runs and nine hits over 3 1/3 innings. He was pulled during a six-run fourth in which he allowed a three-run homer. Rochester won that game, 13-4.

Chapman posted a 1.29 ERA in his four April starts, but has a 6.86 ERA in four starts in May.

Sore Rolen out of lineup on Thursday

ATLANTA -- Reds third baseman Scott Rolen was out of the lineup for the second time in three games as the Reds played the Braves in the finale of their two-game set on Thursday.

"He's very tight and sore and he has been for a couple of weeks," Reds manager Dusty Baker said. "We've got to monitor him big time."

Baker was coy about exactly what has been bothering Rolen, who has a history of back issues. "The usual," Baker said when asked what the problem was.

But rather than a tight back, this may be a tight hamstring.

"I'm OK," Rolen said. "I'm just trying to catch up."

The veteran hit a two-run, pinch-hit homer in the ninth inning to spark a winning rally against Milwaukee in Cincinnati on Tuesday and was 3-for-4 with two doubles Wednesday night against the Braves.

Rolen came into Thursday hitting .419 in his past nine games with two homers and 10 RBIs. His average was .291 and he had eight homers to go with 23 RBIs in 36 games.

With Rolen not in the lineup, Miguel Cairo got the start at third base and second baseman Brandon Phillips moved down to the cleanup spot in the batting order.

Hernandez behind the plate on his birthday

ATLANTA -- It was Ramon Hernandez's 34th birthday on Thursday, but the catcher was in the lineup against the Braves for the afternoon game despite catching Wednesday night.

Having rookie Mike Leake starting for the Reds was a major part of the reason. "He's caught Leake the most," Dusty Baker said.

And the Reds manager joked, "On your birthday, you have to do something. I always tried to hit a home run on my birthday."

Baker said that he'd talked to Hernandez as well as backup Ryan Hanigan and that Hanigan would start two of the three Interleague games in Cleveland over the weekend.

"This was Hernandez's turn to catch back-to-back," Baker said. "I like to tell them in advance [when they're starting] so they know."

Hernandez played in his 26th game and Hanigan has been in 22 so far this season. Both have been productive, with Hanigan hitting .350 and Hernandez taking a .273 average into the Thursday's game with the Braves.

Baker picking his spots with Heisey

ATLANTA -- Although he hit a pinch-hit homer in the ninth inning to tie Wednesday night's eventual 5-4 loss to the Braves, hot-hitting rookie Chris Heisey didn't get the start on Thursday.

Instead, it was Layne Nix who replaced Jonny Gomes in left field as Dusty Baker went with a left-handed hitter against Braves right-hander Tommy Hanson.

Bothered by back spasms earlier, Nix's only previous appearance since May 10 was as a pinch-hitter on Tuesday.

Baker has used Heisey cautiously since he was called up from Louisville at the end of April, but the right-handed hitter has a .353 average and two homers in his 17 at-bats. He has started three games.

"I want to match him up against guys that I think he has a great chance to hit," Baker said.

With the designated hitter used this weekend in Cleveland, Baker will do more mixing and matching with his outfielders. Gomes was the Reds' DH for all nine games at American League parks last season.

Burton strikes out four in Louisville debut

ATLANTA -- Jared Burton made his season debut for Louisville on Wednesday night, allowing two runs on a hit and a walk in 1 1/3 innings at Lehigh Valley. All four of his outs were strikeouts.

The right-hander had been sidelined since being sent to the Minors by the Reds at the end of Spring Training. He made three appearances during extended camp in Arizona before joining Louisville.

Burton has appeared in 154 games with the Reds over the past three seasons, going 10-3 with a 3.47 ERA.