Arizona State (4-7, 1-4 Pac-12) appeared to be in control after taking a seven-point lead, but Arizona rallied to tie it at 82-all with a minute left.
The Sun Devils set up for a final shot and Martin took the ball down the lane, but Tubelis got a piece of the ball, along with his arm.
The Wildcats (11-3, 5-3) rushed the ball up the floor and James Akinjo shot an air ball on a 3-point attempt — he said it was a pass — while being harassed by Marcus Bagley.
Left alone in the lane, Tubelis plucked the ball out of the air and laid it over the rim, sending the Wildcats rushing onto the floor.
Akinjo led Arizona with 24 points.
“I saw the ball going shot and I just caught it and finished,” said Tubelis, who had eight points.
Arizona State let a second straight game slip through its grasp. This one was much tougher to take because of the way it happened.
“We played a winning game and Remy Martin deserved to go to the free-throw line because he was fouled by a player not in the restricted zone,” Arizona State coach Bobby Hurley said. “The player did not have his arms go straight up, one of his arms contacted Remy Martin when he was shooting the ball. I don’t know what else we really need to discuss”
Martin and Josh Christopher had 18 each to lead Arizona State.
The Sun Devils started the season among the favorites to win the Pac-12. They’ve yet to live up to expectations, plagued by COVID-19 issues and inconsistent play on the court.
Arizona State missed five games to positive tests and has yet to have its full team in uniform this season. The Sun Devils arrived at the rivalry game on a three-game losing streak, including a one-point loss to Oregon State after a couple of late defensive breakdowns.
Arizona clobbered the Beavers by 34 points in its last game.
The Wildcats gave Arizona State trouble with their length early Thursday night, forcing difficult shots and creating turnovers while building a 10-point lead.
The Sun Devils continued to struggle with turnovers — 12 in the first half after four total against Oregon State — but used a 9-0 run to pull within two.
Akinjo had 14 points and three of Arizona’s seven 3-pointers to help the Wildcats lead 35-30 at halftime.