The defending World Series champions have lost four straight and fell to 13-20 at home. But the Phillies lead the NL East because they're a major league-best 23-9 on the road.
Hill (3-1) allowed two runs, five hits and walked four in 6 2-3 innings. The lefty baffled a potent lineup with an array of offspeed pitches mixed in with some fastballs.
Rookie catcher Matt Wieters hit a two-run double, matching his RBI total in his first 54 at-bats, Nolan Reimold homered and the Orioles won their third in a row. They rallied to beat the New York Mets and Francisco Rodriguez in the ninth inning Thursday night.
Antonio Bastardo (2-2) allowed four runs and five hits in seven innings, the longest outing by a Phillies starter since Jamie Moyer went seven against Los Angeles on June 5.
Bastardo won his first two career starts on the West Coast, but the hard-throwing lefty is winless in two outings at home.
After the Phillies took a 2-0 lead in the first, the Orioles answered with three runs in the second. Melvin Mora was hit by a pitch with one out and Reimold doubled to left-center. Reimold almost was thrown out at second by center fielder Shane Victorino, but second baseman Chase Utley couldn't hang onto the ball.
Wieters followed a double to deep center, scoring both runners. After Robert Andino grounded out, Hill lined an 0-2 pitch to center for an RBI single to give Baltimore a 3-2 lead. It was his first hit and RBI since 2007 when he played for the Chicago Cubs.
Bastardo retired 10 in a row after Hill's single until Nick Markakis led off the sixth with a single. One out later, Aubrey Huff hit an RBI double off the left-field wall to give the Orioles a 4-2 lead.
Reimold connected off Jack Taschner in the ninth, and Markakis doubled in a pair of runs to make it 7-2. Jayson Werth ripped a two-run double to right field put the Phillies ahead 2-0. Ryan Howard, who walked, scooted all the way home from first, beating the relay throw with a headfirst slide.
The Phillies are 1-6 during their homestand against AL East opponents. They're 7-18 in interleague play the last two seasons, including 3-13 at home.