PITTSBURGH (AP) - Ross Ohlendorf didn't have a happy homecoming.

The Padres' right-hander allowed Clint Barmes' first career grand slam in a nine-run fourth inning and the Pittsburgh Pirates beat San Diego 11-5 on Sunday, ending the Padres' six-game winning streak.

Pitching in Pittsburgh for the first time since being released last October after going 13-27 in four seasons with the Pirates, Ohlendorf was tagged for seven runs - six earned - on five hits in three-plus inning while walking three and striking out one.

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``I was looking forward to pitching here,' Ohlendorf said. ``The first three innings were going well then in the fourth inning I didn't make very good pitches and they took advantage of that.'

Neil Walker went 5 for 5 with a homer and double for Pittsburgh. The Padres had won 11 in a row at Pittsburgh dating to 2009.

Andrew McCutchen and Michael McKenry each drove in two runs during the big inning against Ohlendrorf (4-3) and Cory Burns. Barmes, a 10-year veteran, has 88 career home runs.

Walker had the third five-hit game of his career and second this season, the other coming July 8 against San Francisco.

However, Walker was much happier for Barmes, who has struggled offensively all season after signing a $10.5 million, two-year contract in the offseason as a free agent. He is hitting just .217 after going 2 for 5.

``But he's one of the best teammates I've ever had,' Walker said. ``He's helped me a lot and he has helped this team a lot by playing great defense. It was good to see him come up with the big hit.'

Barmes hadn't committed in an error in 34 straight games, though, until making two in the first four innings before redeeming himself with the grand slam.

``The grand slam is the worst result possible in that situation,' San Diego manager Bud Black said. ``You're still leading 5-2 and the inning is still manageable until that point.'

The Pirates sent 14 batters to the plate in the fourth inning. McKenry drew a bases-loaded walk from Ohlendorf just before Barmes' slam and then singled in the final run of the inning.

``They ambushed us there in the fourth inning and we just couldn't make the pitches along the way to stem the tide,' Black said. ``If you've been around the game long enough, you'll run into those innings where everything they do works, everything you do doesn't and you can't stop the momentum. You've just got to take it.'

Logan Forsythe and Jesus Guzman had two hits each for the Padres and Chris Denorfia led off the game with his fourth home run.

Pittsburgh stopped a three-game skid. On Friday night, San Diego rallied from six runs down for a 9-8 victory over the Pirates.

McCutchen, who leads the major leagues with a .362 batting average, ended a string of 11 hitless at_bats with a double in the fourth. He finished 2 for 6.

Erik Bedard (7-12) made it through five shaky innings for the win, allowing five runs - three earned - and five hits with four walks and six strikeouts. The left-hander improved to 5-0 in his career against the Padres.

Denorfia's homer started a four-run inning. Guzman hit an RBI single and two more runs scored when Barmes, the shortstop, made a throwing error on a groundball by Cameron Maybin.

Forsythe doubled with one in the second and scored when Chase Headley hit a tapper up the line that McKenry, the catcher, fielded and threw to first for the out. Forsythe raced home when no one covered home plate.

Walker hit an RBI single in the second to pull the Pirates to 5-1 then moved in front 10-5 with the big fourth inning. The nine-run inning was Pittsburgh's biggest since it also scored nine on July 20, 2010, against Milwaukee.

Walker homered off Brad Boxberger to lead off the seventh.

NOTES: San Diego signed 1B-OF Mark Kotsay to a one-year contract before the game that carries through the 2013 season. The 36 year old is hitting .275 with one home run and nine RBIs in 55 games. ... Pittsburgh activated RHP Juan Cruz from the 15-day disabled list and optioned RHP Jared Hughes to Triple-A Indianapolis. Cruz missed 23 games because of shoulder inflammation. ... Pirates RF Travis Snider did not start because of tightness in his right hamstring but pinch hit in the sixth inning and walked. ... The 113,539 series attendance was the second-highest for a three-game series in PNC Park's 12 seasons. ... The Padres open a four-game series at Atlanta on Monday night with LHP Eric Stults (2-2, 2.72) facing Braves LHP Mike Minor (6-8, 4.95). ... The Pirates begin a four-game home series with the Dodgers on Monday night with RHP Jeff Karstens (4-2, 3.77) pitching against Los Angeles RHP Aaron Harang (7-7, 3.80).