CINCINNATI -- Through six Triple-A starts, power lefty Aroldis Chapman has been consistent with his inconsistency in the strike zone. But he's also been mostly successful.

Chapman was the winner in Louisville's 5-2 victory over Rochester on Sunday at Louisville Slugger Field. There was a high pitch count again as he tossed 111 pitches over 5 2/3 innings and gave up one earned run and four hits with five walks and six strikeouts. The 22-year-old also allowed his third home run of the season.

The win improved Chapman's record to 3-1 with a 2.84 ERA. In 31 2/3 innings, he's allowed 10 earned runs, 27 hits, 18 walks and notched 36 strikeouts. He has been one of the Reds' top prospects since the Cuban defector was signed to a six-year, $30.25 million contract in January.

Most of Chapman's outings have hovered in the five-inning range. His season high is six innings.

Bruce gunning down runners on the bases

CINCINNATI -- While it's not as dangerous as juggling chainsaws or putting your head inside a lion's mouth, running on Reds right fielder Jay Bruce has become a rather risky business.

In the second inning of Saturday's 14-2 win over the Cubs, Marlon Byrd tried to score from second base on Aramis Ramirez's single near the right-field line. Bruce quickly snagged the ball and fired a perfect strike to the plate that beat Byrd by several feet for the out.

Bruce has two assists this season and in only 98 games last season, had 11 of them. Is taking a run away as good as hitting one out?

"I don't know about that, but I like taking them away," Bruce said. "I assume they're always going to run. The minute you don't assume that, they're going to get you. I just try to put myself in position to make a good throw and make the best throw I can and see what happens."

Manager Dusty Baker was asked about some of the best arms he's seen over his career.

"Oh, there were some good ones," Baker said. "Roberto Clemente, "Downtown" Ollie Brown, Reggie Smith, Ellis Valentine, Dave Parker, Rocky Colavito."

And Bruce?

"He's coming. Not yet," Baker said. "For modern times where there aren't a lot of throwers, he's one of the best. He works on it all the time. This park is shallow and you can stop them from running. I really saw that with [former Reds outfielder] Austin Kearns. He played as good a right field as I've seen. He played shallow. You couldn't go from first to third. If he was accurate, he'd throw you out. That's how Jay is, except he's left-handed."

Hanigan eclipses last season's RBI total

CINCINNATI -- Reds catcher Ryan Hanigan's 3-for-4, five-RBI night in Saturday's win gave him a career-high 15 RBIs in just 17 games played this season. Hanigan -- who did not start on Sunday with Ramon Hernandez catching usual batterymate Mike Leake -- knocked in 11 runs in 90 games last season.

"No. 1, he looks stronger," Reds manager Dusty Baker said. "Balls are jumping off his bat better than they were last year."

Hanigan started 72 games behind the plate last season and his production numbers faded in the second half.

"He kind of wore down when he had to catch every day with Ramon hurt," Baker said. "Between him and Corky [Miller], he was doing most of the catching."

The eighth-inning grand slam Saturday was Hanigan's first in the Majors, and he couldn't recall having one anywhere else.

"It might have been the first ever," said Hanigan, who entered the day batting .409 with two homers and a .509 on-base percentage. "I don't hit a lot of home runs but that one felt good, that's for sure."

Stubbs has trouble bunting for hits

CINCINNATI -- Since he was a first-round Draft pick in 2006, and especially after his callup last season, the Reds have been encouraging speedy Drew Stubbs to bunt for base hits more. It'd be a great way to utilize his speed and a way for Stubbs to be more productive while he struggles.

"We have been working on that since Spring Training," Reds manager Dusty Baker said. "He hasn't picked up the knack yet. He sure can run. If he just tops it, it's a hit. We've been working and working and working."

Worth noting

Reds pitcher Bronson Arroyo's CD "Cover the Bases" is on sale for $15 at Great American Ball Park. Arroyo is donating half of the profits to the Reds Community Fund.