Only two undefeated teams remain in the Pac - 12 .
Only one will stay unbeaten after this weekend as Utah ( 4 - 0 ) hosts Cal ( 5 - 0 ) .
Only two undefeated teams remain in the Pac - 12 , but only one will stay unbeaten after this weekend as Utah ( 4 - 0 ) hosts Cal ( 5 - 0 ) .