'Jannik Sinner made me feel so ashamed I immediately decided to retire from tennis'
The defeat took a toll on the four-time title winner, who thought Sinner had no future. “I called my agent, and my coach wasn’t even there at the time, he was flying in the next day, but I’m like, ‘I just lost to - this kid sucks, he’s terrible. I’m literally quitting tennis for the rest of your life.’”