Senior night wasn’t going the way of Hawaii and Noah Allen for much of regulation in a defensive struggle with Cal State Fullerton.

Nevertheless, Allen’s teammates summoned a little more time and the resolve to send him out a winner at home.

After Sheriff Drammeh tied it up at the free-throw line with 4.2 seconds left, Jack Purchase and Gibson Johnson provided key plays in overtime and Allen scored a game-high 21 points as UH prevailed 64-58 over the Titans in the extra period on Saturday night at the Stan Sheriff Center.

UH (14-13, 8-6 Big West) rallied from a seven-point second-half deficit and snapped Fullerton’s four-game winning streak, drawing even with the Titans (14-13, 8-6) for third place in the conference standings.

Fullerton was held to 36.7 percent shooting — the Titans shot 2-for-20 on 3-pointers — and converted just 25 percent in overtime.

“The reality is that was our best defensive effort all year,” UH coach Eran Ganot said. “Not close.”

Allen, a one-year UH player who transferred from UCLA for his final season, was impressed by the postgame senior ceremony that left him piled up to his eyebrows in lei.

“I feel blessed for the opportunity,” Allen said. “I’ll cherish this for the rest of my life, for sure.”

UH jumped ahead with Purchase’s corner 3 to open the extra period. Purchase (13 points) added another 3, and once Johnson (11 points) blocked Jackson Rowe at one end and banked in a bucket at the other for a six-point lead, Fullerton had to take fouls.

“That was definitely one of the biggest plays of the year, by far,” Allen said. “That’s what I told him on the court. To get a block like that in such a crucial time.”

It was the last of Johnson’s career-high four swats.

“I think I owed it to the team. I had struggled a little bit earlier on and made some mistakes that I wasn’t used to making,” Johnson said. “And so my team expected me to do it. Everyone was in their spots and I was just happy to be in mine to get the block. Man, it was big-time, because we all wanted to get this win for Noah.”

Fullerton had UH’s interior passing game sniffed out. It collected 11 steals among UH’s 17 turnovers.

But once point guard Lionheart Leslie fouled out on a Brocke Stepteau drive with 2:41 left, the Titans were suddenly rudderless.

“That hurt. Just his leadership and his experience, that hurt a tremendous amount,” Titans coach Dedrique Taylor said. “Even still, with him on the bench, we hurt ourselves. You tip your hat to Hawaii, they made the necessary plays, but we missed some bunnies at the front of the rim, they capitalized on them, and we just didn’t play well enough to win tonight.”

Tre’ Coggins scored 15 points for Fullerton, while Rowe had 10 points and 13 rebounds.

UH converted eight of 12 at the line in OT, enough to get the job done after some crucial second-half misses — including Drammeh’s second at the line in the final seconds that might have won it outright.

Afterward, the team honored the 2016 UH Sports Circle of Honor class — former coach Riley Wallace, former center Tony “Bones” Davis and longtime broadcaster Jim Leahey.

All were given jerseys bearing their name. Ganot presented Wallace’s, with Wallace’s program-leading win total — 334 — as the number.

Wallace teared up more than once. The crowd of 5,975 gave him a standing ovation at halftime.

“Well, most importantly they won,” Wallace said. “But it’s an honor. I feel good about it. I know (Ganot’s) a good coach and they have good players this year.”

Of UH’s second-half comeback, Wallace said with a laugh: “Well, shoot more free throws.”

Then it was time to honor Allen, who is on the short list of ’Bows to post four 30-point games in a single season as well as a career. He threw down a two-handed flush for his senior shot and hugged his mother, Grace.

Allen was not assured a postseason when he came to UH. That’s still up in the air, as UH nervously awaits a decision by the NCAA going into the final week of the regular season — road games at UC Davis and Long Beach State.

He had six turnovers Saturday night but shot 9-for-16 from the field.

“He’s a pleasure and we’ll miss him, but we’re going to try to keep coaching him for as long as we can,” Ganot said.