LOS ANGELES - Oneyka Okongwu scored 22 points and Elijah Weaver hit a clutch 3-pointer to force overtime as USC rallied from a 21-point second-half deficit to earn an 82-78 victory over Stanford on Saturday.
Weaver continued to deliver for the Trojans in overtime, scoring eight of his team's 13 points. He finished with 13. His 3-pointer at the regulation buzzer was his only make from distance in five attempts.
USC trailed 69-64 with 33 seconds remaining in regulation after Stanford's Lukas Kisunas made a layup.
Okongwu made a layup with 11 seconds remaining, and after a turnover on the inbound pass, Weaver hit his off-balance 3-pointer while getting fouled on the play. Weaver then missed his free throw that would have given the Trojans the lead.
Seeking its first SoCal road sweep since 2005, Stanford (15-3, 4-1 Pac-12) came away with a split after defeating UCLA on Wednesday. The Cardinal, which lost for just the second time in 10 games with the other defeat coming to No. 5 Kansas, is now tied atop the Pac-12 standings with the Trojans.
Oscar da Silva finished with team-high totals in points (21) and rebounds (9) while Spencer Jones added a career-high 18 on six three-pointers. Tyrell Terry contributed 16 points and six assists for the Cardinal, which shot 49.2 percent but made 8-14 from the foul line compared to USC's 27-36 clip.
Jonah Mathews scored 19 points and Ethan Anderson added 11 as the Trojans (15-3, 4-1 Pac-12), which won for the ninth time in their past 10 games.
Okongwu added nine rebounds as the Trojans, who owned a 38-31 advantage on the boards.
The Cardinal dominated the first half, shooting 65.5 percent from the field and closing it on a 7-0 run to take a 45-25 lead into the break. However, Stanford shot just 34.8 percent after intermission.
The Trojans made their move early in the second half with a 15-2 run to cut the deficit to single digits at 48-40. But a 9-2 Stanford run, capped by a 3-pointer from Jones, put Stanford back up 57-42 midway through the second half.
Another USC run, this one a 12-1 advantage got the Trojans to within seven at 60-56 with 6:25 remaining. They were able to get within 62-60 on a layup by Anderson with 4:47 remaining and refused to go away with a pressure defense that forced 17 turnovers.
Stanford returns to action on Jan. 26 at California.