Eighth seed Venus Williams survived her toughest test at the Australian Open to beat Sania Mirza 7-6 6-4 and reach the fourth round on Saturday.

Mirza produced a superb performance but American Williams eventually wore her down to reach the last 16 and will next meet Li Na of China or Polish qualifier Marta Domachowska.
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Mirza, seeded 31st, made an excellent start by snatching an early break but the Wimbledon champion broke back and played a flawless tiebreak, winning it 7-0.
Games went with serve in the second set until 3-3 when Williams broke and she took her ace count to seven while serving out for victory.
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