SAN DIEGO (AP) - The San Diego Padres are reaching new lows at Petco Park, their spacious downtown ballpark.

While other teams have no problems getting hits and runs at Petco, the Padres do.

On Saturday night, rookie Michael Pineda allowed only two hits while striking out nine in seven innings and Mike Wilson had two run-scoring hits to lead the Seattle Mariners to a 4-0 win against the Padres.

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Pineda (6-2) and relievers David Pauley and Jamey Wright combined to four-hit the Padres and strike out 13.

The Padres were shut out for the ninth time, the most in the majors. San Diego's home record of 8-17 also is the worst in the bigs. The Padres have totaled one run, eight hits and 22 strikeouts in the first two games of this series, and must face reigning AL Cy Young Award winner Felix Hernandez on Sunday. They've struck out 39 times in the first four games of this eight-game homestand.

Padres manager Bud Black doesn't think his players are psyched out by Petco Park.

Asked if it's different playing at home versus on the road, Black said: ``If it is, it shouldn't. I wish I could put a finger on it. I can't.'

It was the sixth home shutout, tied for the most in a season at Petco Park, first done in 2007 and matched last year. It didn't help that the Padres committed two more errors, giving them at least one error in each of their last nine games, and a total of 14 in that streak.

``I don't know if there is anything specific I could point to,' Padres leadoff batter Will Venable said about San Diego's struggles at Petco Park. ``I'm not sure. It's nothing really about the ballpark that makes a difference.'

The Mariners won their fourth straight game. Jack Wilson had two hits, an RBI and scored a run.

The Mariners frustrated the light-hitting Padres for the second straight night. After Erik Bedard allowed only three singles while striking out nine in Friday night's 4-1 win, Pineda allowed only a double to Orlando Hudson in the second and a single by pinch-hitter Eric Patterson in the sixth. The big right-hander struck out the side in his last inning, the seventh, the third time in his nine big league starts that he's struck out nine.

Pauley struck out the side in the eighth and Wright struck out Venable leading off the ninth, making it seven straight Padres to go down on strikes. Wright allowed two straight singles before getting the final two outs.

The Padres had only one runner reach third. Chase Headley walked leading off the fourth, stole second and advanced on Ryan Ludwick's fly out before being stranded.

The Mariners had three straight singles with one out in the second against Clayton Richard (2-5), including Mike Wilson's base hit to bring in the game's first run. Jack Wilson followed with a sacrifice fly to make it 2-0.

After Brendan Ryan was hit by a pitch with one out in the fourth, Mike Wilson followed with an RBI double to right-center.

The Mariners added an unearned run against Pat Neshek in the sixth when catcher Kyle Phillips' errant pickoff throw to third allowed Jack Wilson to score.

Richard allowed three runs and seven hits in five innings, struck out two and walked one.

NOTES: Hernandez will oppose San Diego's Tim Stauffer on Sunday. ... The Mariners have allowed two or fewer runs in their last five games. ... Seattle starters have gone at least seven innings in eight straight starts and 13 of 17. ... Richard is 0-3 in five home starts. The Padres have scored four runs while he was in those games.