There was nothing left for the 76ers to do.

They were getting embarrassed at home, down 18 points in the third quarter, on the verge of going down 3-1 in the series to the Boston Celtics, their season on life support.

That was when they made their stand.

Lou Williams, rookie Lavoy Allen and Andre Iguodala led them to the most unlikeliest of victories. They overcame the large deficit, their horrid 23.1 percent shooting in the first half, and the Boston Celtics' experience to win 92-83 in Game 4 of their Eastern Conference semifinals Friday.

That tied the series at 2-2, with Game 5 in Boston on Monday.

"Everything is off the table," Williams said. "When you're getting your butt kicked, you've just got to fight. That's what we did. We just started chipping away."

By the time Iguodala hit his third 3-pointer of the game, with 36.9 seconds left, the Sixers had a five-point lead. The sellout crowd at the Wells Fargo Center was euphoric.

"We lost our composure," Celtics coach Doc Rivers said, "and they outworked us."

For the first half and into the third quarter, however, it seemed like the Celtics were going to take a commanding 3-1 lead in the series, with a chance to close it out at home.