PHILADELPHIA — The sweep for the Heat was 95 seconds away. Miami held a six-point lead, had The Big Three on the court and a bevy of clutch plays behind them.

All the 76ers had was their unwavering belief.

When they told Doug Collins in the huddle late in the game, “We’re going back to Miami,” his reply was a simple one.

“I’ll be there with you,” said Collins, the Sixers coach.

Lou Williams proved the Sixers right, hitting the go-ahead 3-pointer from the top of the arc over a lunging Dwyane Wade with 8.1 seconds left that lifted Philadelphia to an 86-82 win over the Heat on Sunday and avoided a sweep.