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Unless you’ve been living under a rock the past two decades, you know that Serena Williams has carved out a legendary tennis career. But if you’re a rock dweller, here’s a refresher on just how amazing it’s been.

USA TODAY

As she left the court after a comprehensive semifinal loss to Naomi Osaka, Serena Williams twirled around, took a long look at Rod Laver Arena and put her hand to her heart. It was the kind of slow, heartfelt goodbye that naturally leads to some questions when a tennis player is 39 years old and sees their rivals getting younger, faster, fitter and more confident. 

After yet another loss late in a Grand Slam to a young superstar, each one a bit less competitive than the last, Williams is running out of options and running out of time to sneak in one more major title. 

And she knows it. 

If we’re being honest, Williams’ 6-3, 6-4 loss to Osaka in the semifinals of the Australian Open wasn’t a passing of the torch because that happened several Grand Slams ago. The important issue here is whether Williams still thinks she can win these tournaments, whether deep down she truly believes she can get through not only Osaka, but all…