Oregon State improved to 4-0 in the Pac-12 women’s basketball race with a sweep of the Southern California schools this past weekend.  The Beavers bettered UCLA on Friday 83-73, and then USC on Sunday 76-52.  OSU (4-0, 14-2) hosts Arizona Friday, 7 p.m., and Arizona State Sunday, 2 p.m., on the Pac-12 Networks.  Oregon’s women also improved to 4-0 with a win at USC on Friday 93-53, and then at UCLA on Sunday 72-52.  The Ducks (4-0, 15-1) host Arizona State on Friday, 6 p.m., at Matthew Knight Arena in Eugene, and Arizona on Sunday, noon, both on the Pac-12 Networks.