Walls went 2-for-4 on Friday against the Orioles.
Walls made his season debut after missing the first two months while recovering from hip surgery. He hit seventh in the order and started at shortstop, shifting Jose Caballero to second base and Brandon Lowe to the bench with lefty Cole Irvin on the mound for the O's. It's unclear whether Walls will be able to earn much playing time against right-handed pitching.