The World Series champion Phillies are 0-3 in spring training and have scored a total of seven runs.
"Honestly, you don't know where any pitches are going," Arroyo said. "You don't know whether you're going to bounce the ball in the dirt or paint the black. If they're hitting the ball around the park, at least you're throwing the ball over the dish.
"No matter how you're established in the game, you don't want to go 3-1 and walk a bunch of guys."
Overall, Arroyo was satisfied. He faced nine batters and walked one with no strikeouts.
"It usually takes two starts into the season before I feel I'm really game ready," he said. "This year, maybe I can go deeper in games toward the end."
Juan Francisco and Jonny Gomes hit consecutive doubles off Andrew Carpenter in the Reds' four-run first inning. Manager Dusty Baker had Francisco batting fourth, which is where he hit in the Dominican winter league.
"He's what you want to see in a young hitter," Baker said. "He's aggressive. You want someone you can tone down, not tone up. His strikeouts are from inexperience, but you can turn that flame down. It's hard to turn it up."
Carpenter is trying to earn a starting job with the Phillies, but he failed to retire a batter, walking three and allowing three hits.
"What he did wrong was he didn't get nobody out," manager Charlie Manuel said. "He threw a couple of close pitches to the first hitter, who walked. He just had a rough day. He'll get to go out there again."
Pablo Ozuna homered for the Phillies.
"We hit some balls hard today," Manuel said. "We're catching up. Ibanez hit the ball very well. Our hitting will come around. I'm not worried about that."