Angelique Kerber said she needed to nurse her injured knee after a semifinal defeat at the Dubai Tennis Championships on Friday ended her chances of reclaiming the world number one ranking.
Second-seeded Karolina Pliskova and third-seeded Dominika Cibulkova both lost their opening matches at the Dubai Tennis Championships on Tuesday.
In an all-American matchup, Alison Riske upset 11th-seeded Coco Vandeweghe 6-4, 6-4 to move into the second round at the Dubai Championships on Monday.
Ryan Harrison served up the ace that won him his first career ATP World Tour title, then stuck both hands over his head pointing index fingers skyward in celebration.
American Ryan Harrison and Georgia's Nikoloz Basilashvili, unseeded players seeking their first ATP titles, advanced to the Memphis Open final with straight-set triumphs Saturday.
Donald Young upset No. 2 seed John Isner 7-6 (5), 3-6, 7-6 (6) on Friday night in the quarterfinals at the Memphis Open for his first victory in four tries over the world's 23rd-ranked player.
Canadian tennis star Eugenie Bouchard paid off her lost Super Bowl bet Wednesday by joining blind date John Goehrke at a Brooklyn Nets NBA home game against Milwaukee.
Switzerland's Timea Bacsinszky downed Alize Cornet in straight sets to give the host's a flying start, before Kristina Mladenovic hit back for France later Saturday to level its Fed Cup match at 1-1.
Alison Riske beat Andrea Petkovic to put the United States up 1-0 on Saturday in a Fed Cup World Group tie that got off to an awkward start thanks to a gaffe involving the German national anthem.
Canada's Eugenie Bouchard, ranked 45th in the WTA rankings after a third-round run at the Australian Open, has a date with a stranger after losing a Super Bowl bet.