Mark Teixeira's pain was Jorge Posada's gain.

Teixeira left Tuesday night's Yankees-Red Sox game after getting hit by a pitch on his right knee in the first inning. It looked worse than it turned out to be. Teixeira is day-to-day with a bone bruise.

Posada, who replaced him on the basepaths and at first base, went 3-for-3 -- including his first two righthanded hits of the season -- with a walk in the Yankees' 6-4 loss.

"Jorge was great," Teixeira said. "Three hits tonight. He did a great job filling in there. Hopefully, that gets him going because he's a dangerous hitter."

He hasn't been this season. Even after three hits, Posada's average is only .195.

"It's just one of those things," Posada said. "You see him going down. Joe [Girardi] says, 'Jorge, how are you doing? Go play first base.' As fast as that."

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Posada was happy to be back on the field for more than one reason. It took his mind for a while off Wednesday's scheduled surgery for his 11-year-old son, Jorge Jr.

Jorge Jr. was born with craniosynostosis, in which an infant's skull bones do not fuse properly. He has had eight surgeries; Posada and his wife, Laura, hope this will be the last one.

Tuesday night, Laura posted a Twitter message that said, "Thank you for your prayers for our son, hopefully everything will be OK with the surgery."

Posada, who came into the game 0-for-27 as a righthanded batter, grounded a single past diving shortstop Marco Scutaro in his first at-bat leading off the third inning. He also had an infield single righthanded in the fifth and an RBI single lefthanded off Jonathan Papelbon in the ninth.

It was Posada's weak righthanded hitting that cost him half of his designated hitter job. Girardi started Derek Jeter at DH with Eduardo Nuñez at shortstop Tuesday night. With the Red Sox starting righthanders Tim Wakefield and Josh Beckett the next two nights, Posada should be in the lineup, either at DH or first base. Girardi's other option at first if Teixeira needs to sit out, as appears likely, is Nick Swisher.

Teixeira was hit by a Jon Lester fastball and crumpled in pain. He spent a few minutes on the ground in obvious agony. He limped off -- not putting weight on his right leg -- assisted by coaches Rob Thomson and Tony Peña.

But Teixeira said the pain went away quickly. He was glad the ball hit the side of his knee and not flush on the kneecap. X-rays were negative; ice and a wrap are the treatments.

"Actually, it feels better than it could have," he said. "Obviously, very painful when it happened, but very lucky that it wasn't broken or anything. Hopefully, just a day or two and I'll be all right."

Teixeira came into the game with 18 home runs, second in the major leagues. He had two Sunday in Anaheim.

Lester, who leads the major leagues in hit batsmen, also plunked Russell Martin in the first inning. Martin's was Lester's 10th HBP of the season.