Say this for Doc Rivers  — he’s not going to order any blank white banners with green trim just because his team systematically dismantled one of the best teams in the NBA on Sunday at TD Garden. The Celtics  outscored the Heat, 31-12, in the third quarter, taking the heart right out Miami en route to a 91-72 blowout over the second-place team in the Eastern Conference.
The Celtics could very well see Miami in the playoffs. And if they do, does Sunday’s performance give Rivers a baseline of what it’s going to take to have a chance?
“It’s going to take this, and better because they’re going to be better,” Rivers said. “Miami didn’t play well today. We had something to do with it but they didn’t play well. They’re better than that. We know that.”
A boxing fan growing up in Chicago, Rivers used a pugilistic metaphor to a get a message across to his team.
“I’ve always laughed when people say it’s going to be a boxing match and then when you get hit, you’re shocked,” Rivers said. “I told them, ‘When you go into a boxing match you actually get hit.’ It doesn’t mean you’re not going to win but you go in prepared to get hit. I thought our guys had that mentality and it showed in the second quarter. When they made their run, we showed some resolve.
“I said, ‘Guys, they’re supposed to hit you. You’re in a boxing match.’ You just have to keep punching. That’s how the playoffs are to me. You’ve got to be prepared to get hit hard and then hit back and hit harder.”
Hit back is exactly what the Celtics did Sunday, throwing a body blow when the Heat got to within one on a 10-0 run in the second quarter. But the knockout came in the third quarter, when they opened on a 23-8 spurt to open the second half.
One of the toughest young fighters on the Celtics is Avery Bradley , who got the message loud and clear.
‘Every game’s a boxing match for us,” Bradley said. “Doc did come out and say your going to him them first and they’re going to hit you back.’