SAN DIEGO (AP) - The San Diego Padres are keeping their fingers crossed that right-hander Anthony Bass' injury isn't more than just inflammation in his pitching shoulder.

``Hopefully, it's just that,' manager Bud Black said after Bass left after five innings of the Padres' 4-2 loss to the Texas Rangers on Wednesday.

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Yu Darvish settled down to hold San Diego to five hits over eight innings and got his first major league hit to help the Texas to their sixth straight win.

Darvish (9-4), who struck out eight and walked three, leads all big league rookies with nine victories. He pitched for Japan at Petco Park in the 2009 World Baseball Classic.

Yorvit Torrealba, who was with the Padres in 2010, drew a bases-loaded walk with two outs in the sixth to bring in Josh Hamilton with the go-ahead run. The Rangers swept the three-game series and improved to 12-3 in interleague play, the best in the majors this year.

The Padres have lost five of six since their only three-game sweep of the season, at Seattle last week. San Diego (24-46) has the worst record in the majors.

Bass allowed one run and three hits in five innings. He struck out two and walked one.

``He's been relatively strong all year,' Black said. ``This is the first time that it's popped up during the game. It just came up in the fifth. Overall, the ball just wasn't coming out' correctly.

San Diego has had seven pitchers go on the disabled list, including five starters. Four of the seven have gone on the 60-day DL.

Joe Nathan pitched the ninth for his 15th save in 16 chances.

Darvish allowed multiple baserunners in the first two innings. He walked consecutive batters with one out in the first before getting Chase Headley to line out to second baseman Ian Kinsler, who doubled Cameron Maybin off second to end the inning.

After Alexi Amarista's double down the left field line was interfered with by a fan, putting runners on second and third with two outs in the first. Bass singled just inside first base to give the Padres a 2-0 lead. Bass then stole the first base of his career.

Darvish hit a broken-bat single in the third for his first big league hit. He was promptly doubled off first after Amarista, the second baseman, caught Kinsler's liner, ending the inning.

Alberto Gonzalez, who was with San Diego last year, singled with two outs in the fifth to bring in David Murphy, who walked and stole second.

Darvish settled down after the second.

``I thought he got sharper as the game went on,' Headley said. ``We put some heat on him early and took some good swings and had him on the ropes. But, unfortunately, we hit some balls right at them. That got him out of innings.

``He started to settle down and make his pitches. I thought he really pitched pretty well from the third-fourth innings on.'

The Rangers went ahead in the sixth with two runs on two hits and three walks off three relievers. With one out, Michael Young singled, Hamilton doubled and Adrian Beltre walked to load the bases against Dale Thayer (0-2). Nelson Cruz grounded to Headley at third base. Rather than going for the bag and then throwing to second, Headley threw to second for the second out but Amarista's throw to first didn't get Cruz, and Young scored.

Alex Hinshaw came on and walked pinch-hitter Craig Gentry. Brad Boxberger came on and walked Torrealba to give the Rangers a 3-2 lead.

Young hit a sacrifice fly in the seventh.

NOTES: Darvish ended a four-start road losing streak. ... He was 5-for-36 batting in Japan. ... Everth Cabrera had three hits for the Padres, who are on a 5-game home losing streak. .... Roy Oswalt will make his debut for the Rangers at home against the Colorado Rockies on Friday night. He started four minor league games since signing with Texas on May 29. Oswalt's last major league appearance was with Philadelphia in a Game 4 loss to St. Louis in the NL Division Series. Oswalt said Wednesday he didn't have as much soreness as he expected after his last minor league start, when he threw 100 pitches and allowed six hits and two runs in six innings Sunday for Triple-A Round Rock. He said he was regaining command of his curveball. ... The Padres are off Thursday and open a three-game series against the Seattle Mariners on Friday night. They tweaked the rotation so lefty Clayton Richard (4-7, 3.94 ERA) is scheduled to start Friday instead of Ross Ohlendorf. Jason Marquis is scheduled to start Saturday and Edinson Volquez on Sunday. Ohlendorf's turn will be skipped. ... The Padres swept three games from the Mariners at Seattle last week.