Phegley's battery mate, Oakland starter Jesse Hahn, also impressed, as he's been doing all spring in his bid for a rotation spot. The right-hander allowed four hits, walked two and fanned two in five scoreless innings, lowering his Cactus League ERA to 3.65.
Reds right-hander Raisel Iglesias, a strong bet to make the rotation, offered up Lawrie's home run but retired each of his final five batters, including three by strikeout.
Reds manager Bryan Price said the pitcher's "stuff was pretty flat in the first inning."
"Mechanically, he was breaking down and throwing just a lot of flat pitches and they put some really good swings on them in the first inning. Certainly to his credit, Jeff [Pico, the pitching coach] talked to him with Brayan Pena about getting taller in his delivery and creating a little bit more downward plane with his pitches. He pitched better the last two innings, especially the last inning. He made some strides. Next time out, we expect him to be better from the very beginning."
Left fielder Marlon Byrd collected two hits for the Reds, and Kristopher Negron drove in a run on a triple to right field in the top of the seventh inning, scoring Ivan De Jesus.
Catcher Carson Blair brought in the A's final run with a double in the bottom of the eighth inning, scoring Canha.
Up next: Joey Votto connected for his first home run of the spring on Friday. Votto is likely to be back in the lineup when the Reds play the A's again on Sunday. First pitch in Goodyear is scheduled for 4:05 p.m. ET. Mike Leake will make his fourth start, with Tony Cingrani and Pedro Villarreal also expected to get work. The game is available on Gameday Audio.
Jane Lee is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.