"He played a very good basketball game," Spoelstra deadpanned afterward. "That's all you're going to get out of me right now. He competes. He loves to compete. He loves close games. ... And he's leading us, not just with his talent."
Bosh made a jumper with 1:55 left to end the run and seal the win, Miami's sixth straight overall.
Miami next plays Thursday night in Oklahoma City, an NBA Finals rematch before heading into the All-Star break. The Heat topped the Thunder in the first meeting of the clubs this season, winning in Miami on Christmas Day.
"It's a game we'll look forward to," Wade said.
A glance at the halftime boxscore — Portland 59, Miami 58 — would have suggested the opening two quarters were closely contested, back-and-forth basketball.
Miami started with a flurry, hitting its first seven shots and doing so with James collecting five assists in the game's first 3:52. The Heat led 14-5 after that burst, and were still shooting 75 percent with a minute to go in the opening quarter.
They also were trailing at that point. The Blazers were doing anything they wanted on the offensive end.
"I thought it was a good effort by our team," Blazers coach Terry Stotts said. "Miami's one of the best if not the best team in the league right now and they are playing at a high level. We matched it for about 44 minutes."
More than matched it for a while, too.
Aldridge went on a personal 13-0 run over a stretch of nearly four minutes midway through the half, single-handedly seeming to turn what was a 29-24 Portland deficit into a 37-29 Portland lead. And another quick burst, this time a 10-1 run by the Blazers, gave the visitors what was their biggest lead, 57-43 with 4:48 left in the half.
Take away Miami's sizzling start, and the Blazers outscored the Heat 52-29 over a huge swath of the first half. Miami answered with a 34-12 run, rebuilding a 14-point lead midway through third.
And after Portland had one more rally, it was all Miami in the final minutes.
NOTES: It was the 25th time Lillard scored more than 20 points this season, adding to his rookie-of-the-year credentials. ... Aldridge has at least 11 field goals in each of his past five games. ... The Heat were without Mike Miller, the latest victim of the flu bug that has ripped through the locker room, and lost starting forward Udonis Haslem to a lower-leg contusion in the opening quarter. X-rays on Haslem's shin were negative.