WASHINGTON, April 6 (Xinhua) -- Grand Slam champions Garbine Muguruza and Petra Kvitova each earned second-round wins to move into the last 16 at the Volvo Car Open held in Charleston, the United States on Tuesday.
Sixth seed Muguruza of Spain earned her victory with a 6-1, 6-3 win over qualifier Magdalena Frech of Poland in just 70 minutes while third seed Kvitova of the Czech Republic notched a 7-6(4), 6-2 victory over Storm Sanders of Australia.
"I'm happy that I got this win. I fought hard, and I kept my fighting spirit through the whole match, also in the second set which was tighter than the first set," former French Open and Wimbledon winner Muguruza said.
Two-time Wimbledon champion Kvitova had to grit her way through a closely-contested first set before easing past Sanders in the second set. Kvitova never faced a breakpoint in the clash.