Bay Area native reaches doubles quarterfinals in Miami

   Fifth-seeded Shuko Aoyama and Ena Shibahara of Japan defeated Darija Jurak of Croatia and Nina Stojanovic of Serbia by walkover today to reach the quarterfinals of the Miami Open.

   Stojanovic also withdrew from her third-round singles match against second-seeded Naomi Osaka with a right thigh injury.

   Jurak, 36, was coming off the title in Dubai with Alexa Guarachi, a native of Fort Walton Beach, Fla., who plays for Chile.

   Aoyama, 33, and Shibahara, a 23-year-old native of Mountain View in the San Francisco Bay Area, are set to meet either fourth-seeded Timea Babos of Hungary and Veronika Kudermetova of Russia or alternates Caroline Garcia of France and Nadia Podoroska of Argentina on Tuesday. 

   Babos has won four Grand Slam women's doubles titles (all with Kristina Mladenovic of France), including the last two French Opens. Mladenovic is not playing doubles in Miami.

   College men — Stanford opened its Pacific-12 Conference season with a 5-2 victory over Utah in Salt Lake City. Axel Geller of the Cardinal (3-3) defeated Slava Shainyan 6-3, 6-4 on Court 1.

  The Utes fell to 11-8 overall and 1-4 in the Pac-12.