Top seeds Stephens, Nadal lose early in Acapulco

   The top women's and men's seeds lost Wednesday in the second round of the Abierto Mexicano Telcel in Acapulco.
   Fourth-ranked Sloane Stephens, who grew up in Fresno, fell to qualifier Beatrice Haddad Maia of Brazil 6-3, 6-3.
   Also, Nick Kyrgios of Australia overcame food poisoning and saved three match points to beat Rafael Nadal, the 2005 and 2013 champion, 3-6, 7-6 (2), 7-6 (6) in 3 hours, 3 minutes.
   The 22-year-old Haddad Maia, ranked No. 172, recorded her first victory over a top-10 opponent in seven matches. She has rebounded from two back operations.
   Stephens, 25, was playing in her first tournament since losing in the fourth round of the Australian Open last month.
   "It was just a tough match; obviously she played well," Stephens told reporters. "But I'm not too sad about it. I'm just going to go back and work some more, practice some more and get ready for Indian Wells."
   Mackenzie McDonald, from Piedmont in the San Francisco Bay Area, ousted sixth-seeded Frances Tiafoe of Orlando, Fla., 6-7 (7), 7-5, 6-3.
   McDonald will try to reach his second semifinal on the ATP World Tour in two weeks when he plays Cameron Norrie of Great Britain in a quarterfinal matchup of 23-year-olds today at 3 p.m. California time (Tennis Channel). Norrie, a left-hander, surprised fourth-seeded Diego Schwartzman of Argentina 7-6 (5), 4-6, 6-3.
   Norrie, ranked No. 64, has won both of his matches against McDonald, ranked a career-high No. 71, in straight sets, never losing more than three games in a set. They met twice in the quarterfinals of 2017 U.S. Challengers.
   Third-seeded John Isner beat U.S. Davis Cup teammate Sam Querrey, who was born in San Francisco, 6-4, 6-4. Querrey won the 2017 Acapulco title.