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Serena Williams is in fine form as she unleashes a powerful serve to Russia's Maria Sharapova early in the first set

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The Russian proves to be just as determined as her opponent as the opening set becomes a tight encounter

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The American eventually breaks Sharapova's serve late in the set and holds serve to take it 6-4

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Sharapova fails to hold serve early in the second set but breaks back with some impressive tennis to take it 6-2

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Despite being troubled by a stomach muscle injury, Williams responds to Sharapova and takes a commanding 4-0 lead

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Sharapova appears to be heading for defeat but manages to recover her form - taking full advantage of Williams' injury

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Williams receives further treatment for the injury and her game suffers as a result - allowing Sharapova to take control

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Sharapova slumps to the floor after winning six games in a row to seal a remarkable 4-6 6-2 6-4 victory over Williams

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The young Russian celebrates with the trophy after sealing the memorable win in one hour and 46 minutes