Kytana Williamson scored 23 points and sparked a decisive spurt midway through the game as second-seeded Medomak Valley downed No. 7 York 50-35 in a Class B South girls’ basketball quarterfinal Saturday morning at the Portland Expo.

The Panthers (15-4) will meet No. 2 Spruce Mountain (17-2) in a semifinal at 1 p.m. Tuesday at the Expo.

Williamson was everywhere for Medomak, taking mid-range jumpers, driving inside and keying an aggressive defense.

York was within 19-15 with three minutes left in the half when Williamson went to work. She hit two jumpers and added a 3-pointer, all off steals, then drove for a layup in the final second of the half to give the Panthers a 28-15 lead.

The Panthers added the first four points of the second half to cap a 13-0 run for a 32-15 lead.

Nya Avery led York (12-8) with 11 points but was limited to two in the second half. The Wildcats were also hurt when McKayla Kortes, their top inside threat, was called for two fouls in the first 29 seconds, sat out the rest of the first quarter, then was called for a charge with 4:50 left in the first half.