Serena Williams of the U.S. is congratulated by Caroline Wozniacki of Denmark during their WTA Finals singles semi-final tennis match at the Singapore Indoor Stadium October 25, 2014. REUTERS/Edgar Su
SINGAPORE (Reuters) - If beating Serena Williams is considered the toughest challenge in women's tennis, then spare a thought for Romania's Simona Halep.
To win the WTA Finals, Halep faces the daunting prospect of defeating Williams, not once, but twice in less than a week.
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