ST. PETERSBURG, Fla. (AP) - Jeremy Hellickson struggled with key two-out pitches and it turned out to be costly.

Hellickson (6-7) gave up all four of his runs over four innings while being just one out away of working out of trouble in the Tampa Bay Rays' 4-0 loss to the Baltimore Orioles on Saturday night.

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``I just couldn't make a big pitch when I needed to,' Hellickson said.

Twenty-four of the 50 runs allowed this season by the Rays' right-hander have been on two-out hits.

``I've just got to make better pitches with two outs,' Hellickson said.

Hellickson gave up eight hits, four walks and struck out four.

``They made me work a little bit,' said Hellickson, who threw 88 pitches. ``

Wei-Yin Chen allowed five hits in seven innings and Chris Davis had two RBIs for the Orioles.

Chen (10-6) struck out four and walked one, improving to 4-1 in his past six road starts. After Pedro Strop gave up a single in the eighth, closer Jim Johnson pitched the ninth in a non-save situation to complete a six-hitter.

The Orioles took a 4-0 lead on Davis' two-run single in the fourth off Hellickson. Davis has driven in 12 runs during a nine-game hitting streak.

``Jeremy just had an off night,' Tampa Bay manager Joe Maddon said. ``I just think overall he didn't have the same aggressiveness that he's had in the last couple games. A little bit of tap dancing around the strike zone.'

Matt Wieters put the Orioles ahead 1-0 on a first-inning RBI single. Baltimore had gone 0 for 22 with runners in scoring position in its previous two games.

Nick Markakis made it 2-0 with a run-scoring single in the second. He drove in Nate McLouth, who had a leadoff double. McLouth had his contract purchased from Triple-A Norfolk before the game.

Tampa Bay had two on with one out in the fourth, but Chen struck out Carlos Pena and got a foul pop fly from Sean Rodriguez.

``Their guy pitched well and they did play good defense,' Maddon said. ``They played well. They flat beat us tonight.'

Wieters walked and swiped second for his second stolen base of the game and third this season with two outs in the third. He was thrown out by right fielder Sam Fuld attempting to score on Wilson Betemit's single.

Notes: Orioles manager Buck Showalter said season-ending surgery performed on 2B Brian Roberts to repair a torn labrum in his right hip went well and that the infielder could ready for spring training next year. ... Tampa Bay 3B Evan Longoria, out since May 1 because of a partially torn left hamstring, will be evaluated Monday. Maddon has not ruled out Longoria rejoining the team during a three-game series against Toronto that starts on Tuesday. ... Baltimore RHP Jason Hammel (right knee) could resume throwing off a mound in about 10 days. ... To make room on the roster for McLouth, the Orioles designated OF Endy Chavez for assignment.