Volynets, 14, and Muljat, 15, oust high seeds

   Katie Volynets of Walnut Creek and Jessi Muljat of Sacramento upset high seeds on Wednesday to reach the girls 16 quarterfinals in the USTA International Spring Championships in Carson.
   Volynets, seeded No. 15, ousted No. 2 Marcella Cruz of Marlboro, N.J., 7-5, 6-1. No. 14 Muljat took out No. 4 Cameron Compall of Winnetka, Ill., 6-2, 6-0.
   But No. 3 Niluka Madurawe of Sunnyvale lost to No. 16 Vivian Cheng of Santa Monica, 7-5, 6-4.
   Volynets, 14, will face her doubles partner, No. 12 Cali Jankowski of Carlsbad. Jankowski beat Dasha Kourkina of Brooklyn, N.Y., 6-3, 6-3.
   Muljat, 15, will play No. 6 Peyton Stearns of Mason, Ohio. Stearns topped wild card Gabriella Price of Montebello, N.Y., 6-2, 2-6, 6-4.
    Meanwhile, No. 4 Sam Riffice of Granite Bay and No. 6 Michaela Gordon of Saratoga moved into the third round of the boys and girls 18s, respectively. Riffice is 17 and Gordon 16.
   In the boys 18s, Patrick Kypson of Greenville, N.C., knocked off top-seeded Ulises Blanch of Deerfield Beach, Fla., 6-4, 5-7, 6-4.

USTA INTERNATIONAL SPRING CHAMPIONSHIPS

In Carson, Calif.

(Northern California results only)

Boys

18 singles

Second round

   Sam Riffice (4), Granite Bay, def. Juan Alejandro Hernandez Serrano, Mexico, 6-2, 6-0. 
   Oliver Crawford (10), Spartanburg, S.C., def. Jenson Brooksby, Carmichael, 6-1, 6-2.

18 doubles

Second round

   Brian Cernoch, North Bethesda, Md., and Sam Riffice (5), Roseville, def. Arnav Dhingra, Darnestown, Md., and Nikolai Parodi, Takoma Park, Md., 6-1, 6-3.

16 singles

Third round

   Axel Nefve (2), Hinsdale, Ill., def. Stevie Gould, Corte Madera, 6-3, 7-6 (0).

Girls

18 singles

Second round

   Michaela Gordon (6), Saratoga, def. Melissa Plambeck, Bradenton, Fla., 6-0, 6-1.
   Jade Lewis (10), New Zealand, def. Camille Favero, Sacramento, 6-3, 6-4.
   Maria Mateus (3), Braintree, Mass., def. Sara Choy, Palo Alto, 6-1, 6-0.

16 singles

Third round

   Jessi Muljat (14), Sacramento, def. Cameron Compall (4), Winnetka, Ill., 6-2, 6-0.
   Katie Volynets (15), Walnut Creek, def. Marcella Cruz (2), Marlboro, N.J., 7-5, 6-1.
   Vivian Cheng (16), Santa Monica, def. Niluka Madurawe (3), Sunnyvale, 7-5, 6-4.

16 doubles

Second round

   Kacie Harvey, Braintree, Mass., and Jessi Muljat (4), Sacramento, def. Katya Hersh, Carpentsersville, Ill., and Lauren Lemonds, Indianapolis, 6-4, 1-6 [10-1].
   Vivian Cheng, Santa Monica, and Britt Pursell, Oceanside, def. Cali Jankowski, Carlsbad, and Katie Volynets (7), Walnut Creek, 1-6, 6-4 [16-14].