Kerber, Azarenka advance at Miami Open

Reigning Australian Open champion Angelique Kerber rallied to reach the fourth round of the ATP and WTA Miami Open on Sunday when 108th-ranked Dutch qualifier Kiki Bertens retired due to illness. The German second seed, who upset top-ranked Serena Williams two months ago at Melbourne for her first Grand Slam title, was leading 1-6, 6-2, 3-0 when Bertens met her at the net and said she could not continue. "I was not finding a rhythm at the beginning of the match," Kerber said.