For all of the Red Sox’ success in the first half of the season, they know there is plenty of work ahead, starting with a critical stretch against division opponents.

The Sox have the most wins in baseball and hold a 21⁄2-game lead in the bunched-up AL East. Their first 10 games after the All-Star break are against the three teams closest to them in the standings, beginning tomorrow with a three-game set against the Yankees at Fenway Park.

“It’s a big test for us,” Dustin Pedroia said. “Any time you’re playing in the division you find out where you’re at. It’s a way to make up ground or lose it, so hopefully we play well and win as many games as we can.”

The Yankees make their Fenway season debut without Derek Jeter, Alex Rodriguez, Mark Teixeira and Curtis Granderson. That’s 32 combined All-Star appearances on the sidelines, which explains why the Yanks are treading water 6 games behind the Sox.

“They have a lot of players injured,” David Ortiz said. “We’ve been there before. When you have five or six starting players on the (disabled list), what do you expect? It’s not easy to replace those guys. I know the Yankees are really good at replacing those spots, but they’ve been having a hard time this year.”

The Yankees got another scare in Tuesday’s All-Star Game when second baseman Robinson Cano was hit on the right leg by a Matt Harvey fastball and was forced to leave the game in the first inning. Considering the way the season has gone, the Yankees had to brace for another injury catastrophe, but Cano suffered only a right quad contusion and plans to play tomorrow.

“They’re the Yankees. They’re going to be there in the end,” Pedroia said. “I know they’ve had a ton of injuries, but they’ve still played pretty good baseball. We’ve just got to play good baseball. We’re more worried about us than somebody else.”