BOSTON -- Josh Beckett was completely disgusted with his performance Wednesday afternoon despite helping the Boston Red Sox to a 5-3 victory over the Seattle Mariners in the matinee game of a day/night doubleheader at a wet Fenway Park.

The right-hander worked 6 1/3 innings and allowed three runs on four hits, including a pair of home runs. Beckett was pleased with his first six innings of work before surrendering all four of his runs in the seventh.

“Felt good for about six innings, but the seventh was pretty tough,” said Beckett, who improves to 4-3 this season.

Due to the wet conditions, it was easy to think about the last time Beckett pitched on a wet mound, when he suffered a lower-back strain on May 18 at Yankee Stadium. He was placed on the disabled list the next day and wasn’t activated until July 22.

When asked what the challenges are when working with a wet mound, Beckett said he wasn’t concerned about it.

“I think every inning can be different [when pitching in conditions like this],” he said. “Between their guy being out there and the rain the whole time; that’s the biggest challenge."

“I think everybody has to deal with the elements,” added Beckett. “I think the whole field’s pretty [crappy] if you look at it. I don’t think the mound is particularly [crappier] than the rest of the field. The whole field has been in pretty bad shape."

He also said his back has not been a problem, and deemed himself healthy and ready for the stretch run.

“My back hasn’t been an issue in a few months,” he said. “That wasn’t something I was thinking about.”

Since returning from the DL, Beckett is 3-2 in seven starts. Against the Mariners on Wednesday afternoon he was cruising and allowed only one hit -- a leadoff single to Ichiro Suzuki in the top of the first inning -- before his seventh-inning struggles. Of the three hits he allowed in the inning, two of them were home runs, to Russell Branyan and Casey Kotchman, respectively.

“There’s probably some hurdles he’s got to get by,” said Red Sox manager Terry Francona. “He gives up one and I’m sure he’s thinking about it a little bit, so the good news is he pitched pretty well. The better news is we’ve got [Daniel] Bard sitting out there behind him.”

Bard entered the seventh inning with one out and the Sox holding onto a one-run lead. The hard-throwing right-hander retired the two batters he faced that inning and got three outs in the eighth to set up Jonathan Papelbon’s 32nd save of the season.