Wimbledon champion Petra Kvitova and teammate Tomas Berdych won their singles matches Monday to give Czech Republic a 2-0 win over Bulgaria at the Hopman Cup.

Kvitova won the last five games of her match to beat Tsvetana Pironkova 6-4, 6-2 before seventh-ranked Berdych defeated Grigor Dimitrov 6-4, 6-7 (8), 6-3.
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The countries played a later mixed doubles match to determine the final scoreline, which could affect placings in Group A and decide which teams advance to Saturday's final.
On Monday night, the United States, represented by Bethanie Mattek-Sands and Mardy Fish, takes on a Denmark team comprising women's No 1 Caroline Wozniacki and Frederik Nielsen.
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