World No 1 Garbine Mugu-ruza retired ill with a virus in the first round of the China Open and US Open winner Sloane Stephens went out in a shock defeat.
Spain’s Mugu-ruza suggested in the build-up that she was not fully fit after a leg injury and she lost the first set 6-1 to unseeded Barbora Stry-cova of the Czech Republic.
Muguruza, 23, the reigning Wimbledon champion, called a medical timeout at 2-0 down in the second set and then called it quits after having her pulse taken on the side of the court.
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