MIAMI — Devin Booker scored 23 points, Mikal Bridges added 21 and the Phoenix Suns shook off a slow start to beat the Miami Heat 111-90 on Wednesday night in a matchup of the NBA’s conference leaders.

Booker, returning from a four-game absence for virus-related issues, flirted with a triple-double, finishing with nine assists and eight rebounds. Phoenix improved the NBA’s best record to 53-13, and the reigning Western Conference champion Suns have now beaten all other 29 teams this season — the first time they’ve done that since 2006-07.

Deandre Ayton had 19 points on 9-for-10 shooting and 10 rebounds for the Suns, who got 11 points and 15 rebounds from JaVale McGee, and 11 points apiece from Jae Crowder and Cameron Payne.

Duncan Robinson scored 22 points for Eastern Conference-leading Miami, which lost for just the third time in its last 15 games.

Bam Adebayo and Tyler Herro each scored 17 for the Heat, which played without Jimmy Butler (sinus congestion) and lost key reserve Caleb Martin midway through the second quarter to a knee injury.

The Suns were down by 11 early, took a two-point lead at the half and then outscored Miami 34-19 in the third quarter to blow matters open. Booker capped the quarter with a long 3-pointer, the Heat went 1 for 8 in the quarter from beyond the arc and it was 91-74 going into the final 12 minutes.

Miami came out flying, scoring 25 points in the first 6 minutes — a burst fueled by five 3-pointers. The Heat were 9 for 12 from the floor in that stretch, 5 for 6 from 3-point range and finished the burst by making seven consecutive shots.

That’s when Phoenix’s defence showed up.

The Heat made 7 of their next 21 shots, Phoenix settled down and turned it into a runaway in the third. An 18-7 run by the Suns pushed the margin to 80-65 late in the third and the lead eventually swelled to 27 in the fourth.

TIP-INS

Suns: Phoenix outrebounded Miami 55-38. … The Suns need to go 10-6 in their final 16 games to post the best regular-season record in franchise history. The Suns were 62-20 in 1992-93 and 2004-05. … Crowder got introduced last among Phoenix’s starters, a tribute Miami often gives former Heat players to ensure they get a proper and warm welcome. The fans obliged. … Phoenix improved to 5-3 without Chris Paul (fractured thumb).

Heat: It was the 21st game Butler has missed this season; Miami is 13-8 without its highest-paid player. … Victor Oladipo, in his second game back after 11 months away recovering from leg surgery, had four points in 16 minutes. Don’t expect changes to Oladipo’s minutes allotment anytime soon, Heat coach Erik Spoelstra said. “I’m going to give that same answer for a while,” he said. … Miami fell to 4-14 when scoring 102 points or less. When the Heat score 103 or more, they’re 40-9.

WEIRD SWING

Phoenix allowed 25 points in the first six minutes, a season-worst for that span. The Suns then allowed two points in the next six minutes, a season-best for that span. And the tone was set for the rest of the evening.

WEIRD POSSESSION

The Suns missed eight shots — on one possession. Crowder missed a 3-pointer with 9:39 left in the second quarter, Aaron Holiday then missed a layup and McGee missed two putbacks and a tip-in try before the ball was batted out of bounds by Miami. Landry Shamet tried a corner 3, had it blocked, got the rebound, then tried a layup and got that blocked out of bounds. Finally, Crowder was way off on another 3-point try, and Miami finally secured possession.

UP NEXT

Suns: Host Toronto on Friday night.

Heat: Host Cleveland on Friday night.