Indian Wells: Serena Williams retired with a viral illness from her third-round WTA match at Indian Wells on Sunday while trailing Garbine Muguruza 6-3, 1-0 in a battle of former world number ones. Williams, a 23-time Grand Slam champion, was seeded 10th as she continues to work her way back up the rankings in the wake of time off to have a baby. She got off to a strong start, winning the first three games of the match, but called for the trainer after losing six straight to the Spaniard. After a long talk with the trainer, Williams took the court for the second set, but called it a day after Muguruza held at love in the opening game. It was a disappointing end to Williams's second tournament of 2019, after a quarter-final exit at the Australian Open. Williams and Muguruza were meeting for the sixth time. All five of their prior matches came in Grand Slams, the last two in Grand Slam finals with Williams winning at Wimbledon in 2015 and Muguruza walking off with the 2016 French Open crown.