Rob Pecorelli lined up on the right block for the second of Jalen Burgess’ two foul shots with 1.7 seconds left.

Pecorelli’s Harborfields boys basketball team clung to a one-point lead provided by Alex Bloom’s layup 18 seconds earlier. But Elmont already had inflicted serious damage with offensive rebounding. A tip-in likely would have sent the Tornados home from the Nassau-Suffolk Challenge with their fourth loss of the season.

As Burgess’ free throw sailed through the air and caromed off the back rim, Pecorelli boxed K.C. Ndefo — a 6-3 sophomore who slammed home a miss earlier in the game — into the lane. The 6-2 senior leapt and snared the ball with his right hand, his left being held down by the scrum underneath the hoop.

And that was the game. Harborfields defeated Elmont, 61-60, Saturday at Uniondale.

For Pecorelli and the Tornados (9-3), that last play, coupled with the senior’s impressive shooting, was a welcomed sign.

“He’s back,” coach John Tampori said.

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Pecorelli said he missed the team’s first seven games with mononucleosis. His stamina suffered, and Tampori said Pecorelli needed about two weeks to return to basketball shape.

Pecorelli’s 21-point, five-rebound performance against the Spartans (9-3) indicated the return is complete.

“I’m happy to be back,” said Pecorelli, who converted five three-pointers. “The last couple of games I’ve finally been back to strong enough that I can play all game. It’s good to be back. I’m happy to be a part of this.”

By “this,” he meant a senior-heavy team with realistic aspirations of representing Suffolk in the Long Island Class A championship.

Harborfields flashed its credentials against Elmont by burying 9 of 13 first-half three-point attempts to take a 41-30 lead into halftime. The Tornadoes again responded after the Spartans gained control with an 18-1 run to start the third quarter.

“They [didn’t] panic,” Tampori said.

The shots started to fall — threes by Danny Morgan (16 points), Malcolm Wynter (14 points, 12 assists) and Pecorelli helped Harborfields take a 58-54 lead midway through the fourth. Elmont answered again and gained a 60-59 advantage on a floater by Travis Robinson-Morgan (21 points) with a minute left.

But after Bloom gave Harborfields the lead, Pecorelli took matters into his own hands.

“With everything he does for us,” Wynter said, “it’s great to have him back.”