Tennis star Serena Williams has nothing left to prove. Serena has sealed her name in the history books as the greatest women’s tennis player, whether or not she wins her 22nd major this US Open.

Winning this record, held by Steffi Graf, or winning the calendar Grand Slam (Steffi Graf was also the last player, man or woman, to win all four Grand Slams in the same season 27 years ago), would just be the icing on the cake. Even in this age, when there’s an absolute assembly line of new players coming up the ranks at an astonishing speed, Serena will leave a noticeable void when she exits.