Quan rolls to Winter Nationals title; Nelson falls

   Rudy Quan allowed -- gasp -- four games in a set.
   The resident of Roseville in the Sacramento area then reverted to his dominating ways and won the boys 12 singles title in the USTA National Winter Championships.
   Quan, seeded seventh, beat ninth-seeded Kaylan Bigun of College Park, Md., 6-4, 6-0 today on a hard court in Tucson, Ariz. Quan, ranked 26th nationally in the 12s, surrendered only 13 games in his seven matches and never more than two in a set until the final. In the quarterfinals, Quan crushed top-seeded Nicholas Mangiapane of Davidson, N.C., 6-0, 6-1.
   In the girls 14 final, unseeded Midori Castillo of Bonita in the San Diego region downed seventh-seeded Priya Nelson of Sacramento 6-2, 6-2. Nelson won the Easter Bowl 12s at Indian Wells in March and turned 12 in June.