SIOUX FALLS, S.D. (AP) Matt Mooney scored 24 points and Tyler Flack added 19, including the go-ahead 3-point play in overtime, to lead No. 1 seed South Dakota to a 78-69 win over eighth-seeded Western Illinois in the Summit League Tournament quarterfinal on Saturday.

Flack got the opening bucket of the extra period and converted the free throw after being fouled to put South Dakota on top for good, 71-68 with 4:27 to play.

Western Illinois, which forced overtime with a 3-pointer from C.J. Duff at the end of regulation, was held to a single free throw in the extra period, missing all nine of its shots over the final five minutes as South Dakota steadily pulled away.