Daniil Medvedev says his mental strength comes from this core feeling.
American qualifier on biggest lesson gained from inspired Miami quarterfinal run.
Tennis fans aren't the only ones excited about a possible Sinner vs. Alcaraz rematch.
The Canadian says she is optimistic about her return, and adds that it could have been worse.
"As soon as I got the shoulder stronger, I said, Okay, we have to make my serve a weapon," Sorana Cirstea said of her sharpened serve.
The Romanian credits her new coach Thomas Johansson for her recent glow-up in form.
The American was "gassed" but found a way to crack through for the win.