19-year-old Watson led by a set and a break before Sharapova fought back to force a decider . Wimbledon champion Petra Kvitova goes out in first round of U.S. Open . The Czech Republic will play the winner of Sunday's women's singles final between American Sloane Stephens and Russian Maria Kirilenko. Maria Sharapova taken to three sets by Britain 's Heather Watson .
Wimbledon champion Petra Kvitova goes out in first round of U.S. Open . The Czech Republic will play the winner of Sunday's women's singles final between American Sloane Stephens and Russian Maria Kirilenko. Maria Sharapova taken to three sets by Britain 's Heather Watson .