After the A's touched Mike Wright for five runs over five-plus innings, Semien went deep off Orioles lefty reliever Brian Matusz in the eighth to close Oakland's scoring.
Utilizing an effective curveball all day, Hill struck out five and walked three, throwing 103 pitches to lower his ERA to 2.39.
MOMENTS THAT MATTERED
Singles night: Of the A's 15 hits, 12 were singles, three of them hit in a row with two outs in the second to bring in their first run of the day.