As Deron Williams has flourished in the six weeks since the All-Star break in the wake of getting platelet rich plasma treatment and a third round of cortisone shots in both of his ailing ankles, the one thing that has been missing from his game has been throwing down his first dunk of the season.

But Williams finally checked that off his list in the Nets’ 113-95 runaway win over the Cavaliers Wednesday night in front of 14,863 inside Quicken Loans Arena.

With 2:57 to go in the second, Williams brought the ball upcourt and blew past Cavs guard Wayne Ellington with ease. From there, the Cavs defense parted like the Red Sea, allowing Williams to glide to the basket and slam the ball home.

“I didn’t really plan it,” Williams said with a smile afterward. “It’s just something that happened.”

Williams may not have planned it, and did his best to downplay it, but it was a significant milestone in what has been a remarkable resurgence for the star point guard since the All-Star break, considering that Williams said a few weeks ago his ankles were causing him so much pain that he couldn’t dunk.

Including last night’s performance, in which he finished with 24 points on 8-for-14 shooting from the field to go along with eight assists, Williams is now averaging 22.2 points and 7.9 assists, shooting 46.9 percent from the field and 43.4 percent from 3-point range.

Williams’ dunk last night was a perfect indicator of how the night went for the Nets (43-31), who easily cruised to what was a franchise-record 21st road win of the season while handing the hapless Cavaliers (22-52) their 10th straight loss and their 12th loss in their last 13.

Not only did the Nets set their franchise record for road wins and clinch their first-ever winning road record for a season in franchise history with last night’s win, but they finished the eight-game, 17-day Circus Trip with a 5-3 record.

“For this franchise, now 36 years old, it’s the most wins we’ve ever had on the road,” Nets interim coach P.J. Carlesimo said. “It’s the first time we’ve ever had a winning record on the road. That’s really a significant accomplishment.

“I’m really proud of that, and for [the players]. That’s a hell of a job.”