The Boston Celtics are 8-11 in closeout games going back to the 2008 playoffs. They’ve never swept a team in the new Big Three era.

Their two chances came during last season’s playoffs when they went up three games on the Heat in the first round (dropping Game 4 on the road) and the Magic in the conference finals (losing Game 4 at home and Game 5 in Orlando).

“We still have to play the games,’’ Kevin Garnett said. “This is a team that can put up a lot of points and they’re playing at home. So we’ll focus on [Game 3], enjoy tonight, then get ready for Game 4.’’

Miami is also up, 3-0, in its series with Game 4 tomorrow in Philadelphia. If both the Celtics and Heat sweep, the earliest their second-round meeting could start would be next Sunday, giving both teams six days to rest.