The right-hander will pitch Tuesday night in San Francisco against the Giants a little more relaxed, a little more confident and feeling ready to go.
"Adrenaline was through the roof my first outing, but now I feel a lot more relaxed -- kind of laid back," Arrieta said Sunday morning. "I know a little bit more of what to expect in the starts to come."
Entering Sunday, Arrieta's victory against the Yankees was the only win by an Orioles starter in the past 16 games. He held New York to three runs on four hits in six innings.
The right-hander struck out six and walked four and clearly settled down as the game went along.
"I learned a lot," he said. "My stuff really plays at this level, and it's good enough to pitch well and win. I can go out there and trust my stuff and be confident that it's [going to] give the team a win. That's the biggest thing I could have taken out of my first start."