The spunky freshman forced his way inside, scored from close range and drew a foul, completing the three-point play to cut the lead to 77-74 with 12 seconds remaining. With the Cowboys pressing, Guerrero then picked Michael Hale for a steal and immediately fired in a 3-pointer to tie it.
“It looked like Reggie Miller back then,” said Nash, who added 18 points and nine rebounds.
UTSA's Sei Paye, who had fired in a game-winning 3-pointer at the buzzer to beat Oral Roberts on Tuesday night, missed on a running shot in the final seconds. And once into overtime, Guerrero completed the storybook finish.
He scored on a running, reverse flip shot to put OSU up 81-80, then drilled two 3-pointers after the Roadrunners had pulled back in front, sending the Cowboys ahead 87-85 with :56 to play in the overtime.
UTSA never scored again, with Guerrero taking a charge to halt one possession, then finally pulling the down the final rebound and dribbling the clock out, before firing the ball high in the air.
Even when a loss looked certain, Guerrero said he always believed.
“The biggest cheerleader, who never ever gave up, was Guerrero,” OSU coach Travis Ford said. “He's the one guy in the huddle, when everyone was kind of bleak, fans were leaving and I was ready to go with them.
“He's the one who kept saying to everybody in the huddle, ‘We're going to win this thing. We're winning.'
“And he would break our huddle saying, ‘One, two, three win.' Everybody else is just kind of looking at him. True story.”
Box score: OSU 90, UTSA 85