"We had very good defensive concentration," Wizards coach Flip Saunders said.
"Our guys came back, we didn't try to force things offensively. We went to the guys who were hot."
Miami got a boost from Mario Chalmers in the second half. He had 18 of his 20 points after halftime, and his 3-pointer with 4:48 left in the third cut the deficit to 63-60. Washington kept its lead, though.
Wade missed two free throws with 2:03 left with the Wizards ahead 90-81, and Miami only had six baskets in the fourth -- one on a Washington goaltending call.
"We just came out like we didn't want to play. It was like it was Thanksgiving and we stayed home," Beasley said. "They brought every weapon they had at us tonight. They just wanted it more than we did."
Wade couldn't get much going in the first half, missing his first three shots and turning the ball over three times. He went 3 for 9 and picked up three fouls in the final 3:25 of the second quarter.
Beasley and O'Neal combined for the Heat's first 18 points, mostly on tip-ins and jumpers, but Miami went cold to start the second quarter. The Heat missed eight of their first nine shots, shooting 33 percent from the floor in the period, as the Wizards put together an 11-2 run to go ahead, 37-26.
Jamison, who finished with 13 points on 60 percent shooting in the first half, also had 13 rebounds.
O'Neal flew back just before the game because he was with an ill relative. The Heat held a moment of silence for Pollin. The Wizards honored him by wearing a black stripe on their jerseys. Miami's last three wins have each been settled by one point. The Heat defeated the Magic, 99-98, with Beasley's dunk, beat the Hornets 102-101 three nights before on Haslem's tip-in, and won 81-80 on Nov. 14 against New Jersey after Wade sank a 3-pointer with less than a second left.