LOS ANGELES — Ohio State needed another last-second shot, and Aaron Craft had the ball at the top of the key again.
But last week's hero gave it up to the hottest hand on the floor, and LaQuinton Ross sent the Buckeyes to the brink of their second straight Final Four.
Ross hit the tiebreaking 3-pointer with 2 seconds to play, and Ohio State advanced to the West Regional final with a 73-70 victory over Arizona on Thursday night.
Ross, Ohio State's remarkable reserve, scored 14 of his 17 points in the second half for the second-seeded Buckeyes (29-7), who rallied from an early 11-point deficit. With Ross making a series of tough shots capped by that dramatic 3, Ohio State weathered the sixth-seeded Wildcats' late charge for its 11th consecutive victory since mid-February.
"It feels great, man," said Ross, a once-ballyhooed recruit who has grown into a bigger role in the past two months. "I think this is what every player grows up looking at on TV, wanting to hit that big shot for an NCAA tournament team. It just feels great right now."
Deshaun Thomas scored 20 points for Ohio State, and Craft added 13 before ceding Ohio State's final shot to Ross when the Wildcats didn't make the proper switch on the Buckeyes' screen. Ross coolly drilled his second 3-pointer and set off a wild celebration in the Ohio State section of the Arizona-dominated crowd.
Craft hit an awfully similar 3-pointer against Iowa State last Sunday to send the Buckeyes forward with a 78-75 victory, but Ross didn't flinch at his turn under pressure in this increasingly magical Ohio State season.
"LaQuinton has really grown in a lot of areas," Ohio State coach Thad Matta said. "I think the biggest thing he's done is he's engaged himself in all the little things, and that's made him a better basketball player. We're proud of him."
Arizona couldn't get off a shot on its last-second inbounds heave, and Mark Lyons greeted Ross in the postgame handshakes with a joking "I can't stand you!"
Lyons' acrobatic three-point play for the Wildcats (27-8) had tied it with 21.8 seconds left, thanks to a foul by Ross. But Ross knew he might be in for a special moment when he was assigned Kobe Bryant's stall in the Lakers' locker room at Staples Center — and he nailed a shot that would have made the NBA star proud.
On Saturday, Ohio State will face ninth-seeded Wichita State. As the only top-eight seed left in the West, the Buckeyes will be Atlanta-bound with one more win.
Sam Thompson added 11 points for the Buckeyes, who trailed for nearly the entire first half before pushing ahead and nursing a small lead throughout the final minutes.
Lyons scored 23 points including his gutsy three-point play for the Wildcats, who rallied from a 10-point deficit in the second half before falling just short of their second NCAA regional final in four years. Solomon Hill added 16 points in his native Los Angeles, but the rest of Arizona combined for just 31 points on 10-for-29 shooting.
"I tried to force the issue too much to get back on the hot start," Lyons said.
After Arizona jumped out to that early 11-point lead, Ohio State gathered its game and mounted a 33-13 surge spanning halftime, taking a 53-43 lead with 11 minutes left. The Wildcats finally answered, but Ross kept the Buckeyes in front with nine consecutive points down the stretch.
Although Arizona coach Sean Miller lamented his team's coverage mistake on the final possession, he still praised his players.
"I'm proud of our guys' effort," Miller said. "We tried hard, and losing in this tournament when you play hard to the end hurts more in the beginning, but I think you leave with a lot of pride knowing you played your heart out."
Wichita State 72, La Salle 58
At Los Angeles, Wichita State went from sweet to elite, beating La Salle to reach the final eight of the NCAA tournament for the first time in 32 years.
Malcolm Armstead scored 18 points, Carl Hall added 16 and freshman Ron Baker 13 for the ninth-seeded Shockers, who proved their upset of No. 1 seed Gonzaga in the third round was no fluke. They never trailed in this matchup of small schools whose past NCAA tourney success was long buried in the history books.
Marquette 71, Miami 61
At Washington, after sweating through a pair of edge-of-your-seat comebacks early in the NCAA tournament, Vander Blue and Marquette figured out how to put one away early as the Golden Eagles earned their first trip to the Elite Eight since 2003 with a victory over Miami.
Blue, who spurred the rallies that beat Davidson by one and Butler by two, finished with 14 points. He wasn't Marquette's leading scorer — that was Jamil Wilson with 16 — but it was Blue's offensive and defensive energy that pushed the Golden Eagles to a double-digit lead in the first half, a spread Miami never came close to making up.
The third-seeded Golden Eagles (26-8) are aiming for a spot in the Final Foul for the first time since Dwyane Wade took them there a decade ago. Miami (29-7) made only 35 percent of its field goals and missed 18 of 26 3-pointers. Shane Larkin scored 14 points to lead the second-seeded Hurricanes, whose NCAA run to the round of 16 matched the best in school history.