Serena Williams of the USA reacts as she plays against Barbora Strycova of the Czech Republic during round four of the Women's Singles at the Australian Open Grand Slam tennis tournament in Melbourne, Victoria, Australia, 23 January 2017. EPA/LUKAS COCH AUSTRALIA AND NEW ZEALAND OUT

Serena Williams powers towards grand slam record after racing into Australian Open quarter-finals

American remains on course to beat Steffi Graf’s Open-era mark as the 35-year-old also closes in on a return to the world number one ranking

Topic |   Australian Open

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Serena Williams of the USA reacts as she plays against Barbora Strycova of the Czech Republic during round four of the Women's Singles at the Australian Open Grand Slam tennis tournament in Melbourne, Victoria, Australia, 23 January 2017. EPA/LUKAS COCH AUSTRALIA AND NEW ZEALAND OUT
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