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Doubles schedule burdens Williams
Serena Williams must hope the effort of playing two doubles matches in a matter of hours does not take a heavy toll as she tackles Victoria Azarenka in the Wimbledon semi-finals on Thursday.
Together with sister Venus, Williams returned to Court Two on Wednesday to finish off a rain-delayed second-round clash against Russians Maria Kirilenko and Nadia Petrova, and the pair then played a full match on the same court against fellow American Bethanie Mattek-Sands and India's Sania Mirza.
The Williamses won both and are billed to play doubles again on Thursday against Raquel Kops-Jones and Abigail Spears, but only once Serena's rather more important singles clash with world number two Azarenka is out of the way.
The four-time singles champion at Wimbledon, who with Venus has also won the doubles title on four occasions, heads into her match against Azarenka boasting a record of seven wins in eight past meetings with the Belarusian.
Yet 30-year-old Williams has no doubt Azarenka, who won the Australian Open in January, is an opponent to be feared.
"She's playing unbelievable. I think she's played so well this year," Williams said.
"Already having a grand slam under her belt is really great. She did it in such style, so it's not going to be easy."
Williams says she has "absolutely nothing to lose", positioning herself as the underdog.
That might amount to a stab at mind games, but as sixth seed Williams pointed out: "She's had a better year than I have. She's been so successful already.
"Going against a player like that, I feel like she almost has an advantage."