CINCINNATI -- Enerio Del Rosario doesn't speak much English but the newest Reds reliever could easily convey his feelings on Monday.

"Happy," said Del Rosario, who received his first big league promotion from Triple-A Louisville when starter Homer Bailey was placed on the 15-day disabled list.

In 20 appearances for Louisville, the 24-year-old Del Rosario was 1-1 with a 1.46 ERA. He had four walks and 17 strikeouts over 24 2/3 innings. What impressed the Reds most in Spring Training was his sidearm delivery and the movement on his pitches. Many sidearm throwers have velocity in the 80s mph range but this right-hander can get into the low 90s.

"They told me he throws strikes, has a very good sinker," Reds manager Dusty Baker said. "He fields his position very well and he is hungry to succeed."

Del Rosario started last season in Class A Sarasota and went 3-1 with a 1.68 ERA in 50 games combined at three Minor League levels. Before 2009, he was on the verge of being released when he was an unsuccessful overhand pitcher. With the help of pitching coach Tom Brown, who is now at Double-A Carolina, Del Rosario switched to sidearm.

"It helped with everything. I threw more strikes," Del Rosario said through bullpen coach Juan Lopez. "It took about two weeks. I started doing it in 'A' ball."

Del Rosario will help pick up a worn down bullpen that's gotten heavy use lately. The Reds are barely halfway through a 20-game stretch without a scheduled day off.

"He's gone as long as two innings and we'll try to match him up, right-left -- I've got some Minor League stats on him," Baker said. "We know who he's fared better against."

Del Rosario made his first Major League appearance in relief of Aaron Harang in the seventh inning of Monday's 7-5 win over the Pirates and now has a very unique line in the boxscore. It says he had zero batters retired and one strikeout. His lone batter, Andrew McCutchen struck out but reached safely on catcher Ryan Hanigan's passed ball.

Cueto still in line to start

CINCINNATI -- All signs point to Johnny Cueto being able to make his next scheduled start on Thursday against the Pirates. Cueto exited Saturday's start vs. the Indians after six innings and 93 pitches, because of a blood blister on his right index finger.

"We caught it before it got too serious," manager Dusty Baker said Monday. "I told him to call his Mama up and see if she's got any Dominican remedies, I'm sure that she does."

In his last five starts, Cueto is 4-0 with a 2.18 ERA, six walks and 30 strikeouts. In a 6-4 win over Cleveland, he allowed two earned runs and four hits with two walks and five strikeouts, but kept the Indians scoreless for his first five innings.

Cueto is 7-2 with a 3.30 ERA lifetime against Pittsburgh.

Chapman to throw on side Tuesday

CINCINNATI -- Top lefty prospect Aroldis Chapman will test the blister on his middle finger when he throws on the side Tuesday. Chapman's Monday start for Triple-A Louisville was scratched because of the injury.

"They'll have a better indication to see if he could pitch Thursday," Reds general manager Walt Jocketty said.

Chapman, the 22-year-old Cuban defector, is not a candidate to fill Homer Bailey's rotation spot Friday after Bailey went on the disabled list on Monday.

Owings not available to pitch

CINCINNATI -- Reliever Micah Owings, who threw 60 pitches over 2 2/3 innings in emergency relief for the injured Homer Bailey, was not available from the bullpen on Monday. Owings was available to pinch-hit.

"For the next couple of days, I have another hitter," manager Dusty Baker said.