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Serena Williams -
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American Serena Williams was gifted a place in the quarter-finals of the Australian Open on Monday when Victoria Azarenka was forced to retire, appearing to be physically exhausted and distressed in the heat.
Azarenka, from Belarus, was leading 6-3 2-4 but threw in the towel after struggling to keep her balance or even her hold her racket.
She broke down in tears and needed assistance from her trainers to get off the centre court.
Williams, a three-time winner of the Australian Open, will play Russia's Svetlana Kuznetsova in the quarter-finals after her fourth-round opponent Zheng Jie retired with a wrist injury.