Jonathan Gilling scored five points in the extra period for the Sun Devils, which allowed a six-point lead in the final minute of regulation to get away.
In overtime, with USC down by three, the Trojans' Jio Fontan missed a 3-pointer from the top of the key with 5 seconds left.
Arizona State led 82-76 with 26.8 seconds left but J.T. Terrell hit back-to-back 3-pointers and Jio Fontan hit an off-balance 3-pointer from 25 feet with 0.4 seconds remaining to force overtime.
Evan Gordon had 28 points and three assists for the Sun Devils (15-4, 4-2 Pac-12). The teams were tied at 69 with 4:40 left before Arizona State ran off eight straight points.
Fontan led the Trojans (8-12, 3-4) with 25 points and Terrell scored 20.
More Sports Headlines
Silvertips’ overage goaltender Lotz heads home to await fate Seahawks' Carroll: Refs missed call but play by Wright was 'smart' Huskies face former coach Sarkisian for first time Caldwell tells Lions not to talk about controversial play Owners offer diverging views on how to return NFL to L.A. Big weekend for Sounders’ Schmid, Barrett Astros beat Yankees 3-0 in American League wild-card game Falcons’ receiver White: ‘I’m not disgruntled’
Our new comment system is not supported in IE 7. Please upgrade your browser here.