BOULDER, Colo. (AP) Josh Scott scored the first two baskets of the second overtime and No. 19 Colorado fought back from an early 15-point deficit to beat Texas Southern 85-80 on Tuesday night.
The Buffaloes (6-0) withstood a 39-point performance by Texas Southern's Omar Strong, who made nine 3-pointers, including three in the extra sessions.
Spencer Dinwidde had 24 points to lead Colorado, which is off to its best start since opening 6-0 in 1989-90. Scott finished with 18 points and 12 rebounds, Askia Booker added 15 points and Andre Roberson had 11.
Fred Sturdivant had 12 points and 11 rebounds for Texas Southern (1-6).
Tied at 59 at the end of regulation, Booker converted a three-point play with 1:38 remaining in overtime for a 68-66 Colorado lead. But Strong was fouled attempting a 3-pointer and made two free throws to re-tie it.
Booker drained a 3-pointer from the corner with 41 seconds left in the first overtime to make it 71-68 but Law Johnson-Danner answered with a 3-pointer for the Tigers and Booker's long jumper rimmed out at the buzzer, forcing the second overtime.
Scott hit successive baskets from up close to start the second overtime, getting fouled in the lane and converting the free throw after the second shot to give the Buffaloes a 76-71 lead they would not relinquish.
After Sabatino Chen drove in for a layup with 1:09 left, Dexter Ellington made one of two free throws for the Tigers. A fastbreak layup by Chen gave the Buffaloes an 80-72 lead, enough to withstand another 3-pointer by Strong with 11.5 seconds remaining.
Trailing by 10 points at halftime, Colorado finally shook off its early shooting woes to run off 11 straight points starting the second half, moving in front 40-39 on Roberson's fastbreak layup with 15:35 remaining.
Roberson, whose blown breakaway dunk midway through the opening period epitomized Colorado's earlier offensive struggles, had seven points during the stretch.
The Tigers came back to take a 50-48 lead when Penn connected on a 3-pointer with 9:02 left. Colorado put together an 8-0 flurry for a 56-50 lead with 6:44 remaining. Dinwidde sparked the run with two 3-pointers.
Madarious Gibbs made both ends of a 1-and-1 to pull the Tigers to 57-56 with 3:06 left and Scott made two free throws for Colorado with 1:51 left.
Roberson fouled out with 1:30 left when he fouled Aaron Clayborn as he went up for a shot. Clayborn made one of two free throws, getting the Tigers within two points.
Booker missed a jumper and Sturdivant drove in for a layup that tied it at 59-all with 42.5 seconds left.
Maneuvering for a tie-breaking shot, Colorado hung on to the ball too long, turning it over with 6.8 seconds left in regulation when the 35-second shot clock expired. Strong missed a 15-foot jumper at the buzzer.
Colorado missed its first six shots from beyond the arc before Booker connected at the buzzer, pulling the Buffaloes within 39-29 at halftime after trailing by as many as 15 points.