The Czech-American tennis player, who dominated the sport in the 1980s, issued a statement through her representative, saying battling cancer is "going to stink for a while but I’ll fight with all I have got”.
On 20-match winning streak at Wimbledon, Williams will face German world number 10 Angelique Kerber on Saturday in a repeat of the 2016 showpiece won by Williams.
For the first time since 1981, the US Open women's semi-finals will be an all-American affair with seven-time Grand Slam champion Venus Williams and three first-Slam-title hopefuls in the mix.
Kerber will lose her number one ranking as Williams will become the oldest quaterfinalist since Martina Navaratilova
Venus Williams becomes the oldest player to reach the last 16 at Wimbledon in 23 years as the five-time champion defeated Japan's Naomi Osaka.
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