Chapman defected from Cuba last year and agreed to a $30.25 million, six-year contract with the Reds in January. The left-hander has allowed three hits over four scoreless innings in two spring outings, but wasn't pleased with his latest effort.
"I wasn't as sharp; I got some pitches out of the zone," Chapman said through an interpreter. "The last few games I have thrown a lot of fastballs. I wanted to throw more sliders. I was not able to finish my slider."
Bronson Arroyo started for Cincinnati and pitched three scoreless innings. The right-hander allowed two hits, struck out one and walked none.
"I couldn't get after it," he said. "I was just trying to throw strikes, hoping they couldn't square the ball up. It was one of those days you just muster it up and see what you've got. I was hoping to hit my spots and get quick outs."
Dodgers starter Clayton Kershaw also pitched three scoreless innings, but continued to have control problems with two walks. The lefty was visited by a trainer at one point but said there was no issue and he was merely having trouble keeping his fingers moist in the dry weather.
"It wasn't great and it wasn't bad, it was just kind of average," Kershaw said. "I have stuff to work on and there was stuff I did all right. It was a good step forward, I guess."
Chapman also struggled with the low humidity, saying it was part of the reason his slider was ineffective.
Dodgers third base coach Larry Bowa left the game with what the team called stomach cramps. He went to a hospital with team doctor Kenneth Landis, but the Dodgers said the situation wasn't serious.
Chris Heisey also went deep for the Reds, connecting in the sixth against George Sherrill.
Angelo Songco and Christian Lara each drove in a run in the ninth for Los Angeles.
Arroyo sang six songs Thursday night at Jake Peavy's charity concert in Phoenix. ... Reds guest instructors Barry Larkin and Sean Casey both arrived in camp. ... Dodgers OF Garret Anderson expects to get into his first spring game on Sunday. ... Nick Jonas from the pop group, the Jonas Brothers, took batting practice in a Dodgers uniform before the game, breaking a bat in the process.