Serena Williams, who won her eighth title of the year at the Rogers Cup in Toronto, says she still gets nervous before matches. The world No. 1 admitted that she was jittery before she defeated Sorana Cirstea in the final, 6-2, 6-0, and will likely be nervous for "hopefully seven matches" at the upcoming U.S. Open.

"I think it almost is exciting to have butterflies, because it means that you care about it so much and you still get nervous," Serena said. "I think when the day comes and I'm not nervous and don't have butterflies, then I need to start rethinking what I'm doing."