Wimbledon champion Serena Williams battled past China's Li Na 6-3, 7-6 yesterday to reach the second round of the Stanford Classic in California, where she will be joined by sister Venus, 6-2 6-3 victor over Canada's Stephanie Dubois.
Top seed Serena led 6-3, 5-2 before Li fought back to force a tiebreaker.
Tennis: Williams sisters advance
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