A. Zamarripa reaches quarters in Winter Nationals

   Allura Zamarripa of Saint Helena in the Napa area upset No. 13 seed Katja Wiersholm of Kirkland, Wash., 7-5, 6-2 today to reach the girls 16 quarterfinals in the USTA National Winter Championships in Orlando, Fla.
   Wiersholm is the third seed Zamarripa has beaten in the hard-court tournament. She also ousted No. 4 Anessa Lee of San Marino in the Los Angeles region in the first round and No. 17 Allison Zipoli of Winnetka, Ill., in the third round.
   Zamarripa will meet No. 11 Carmen Corley of Albuquerque, N.M. Corley topped Bridget Stammel of Dallas 6-1, 6-7 (7), 6-2.
   No. 17 seed India Houghton of Belvedere Tiburon in the San Francisco Bay Area lost to Justine Dondonay of Alhambra in the Los Angeles region 4-6, 7-5, 7-6 (6).
   Zamarripa also advanced to the doubles semifinals with her sister Maribella. Seeded fourth, they will face top-seeded Corley and Gianna Pielet of El Paso, Texas.
   Three NorCal girls advanced to the singles quarters in the Winter National 14s in Tucson, Ariz. No. 7 Priya Nelson of Sacramento and No. 14 Tomi Main of Seaside in the Monterey area prevailed in three sets, and No. 10 Anushka Khune of Palo Alto won in straight sets.
   Unseeded Gavathri Krishnan and Emily Novikov, both from the San Jose area, lost in the girls 12s in Tucson.
    In the boys 18s in Orlando, No. 3 Kevin Zhu of Pearland, Texas, beat Marcus McDaniel of Vacaville (near Sacramento) 6-2, 6-4.
   Two NorCal boys stayed alive in Tucson. No. 14 Brian Chong of Cupertino (near San Jose) survived against No. 8 Louis Cloud of San Antonio 3-6, 7-6 (3), 6-3 in the 14s. No. 7 Rudy Quan, from the Sacramento suburb of Roseville, routed No. 11 Meethre Bardot of Frisco, Texas, 6-0, 6-2 in the 12s.
   Quan will take on No. 1 Nicholas Mangiapane of Davidson, N.C.