The world of tennis fashion was abuzz during the 2013 Gerry Weber Open at Halle (one of the traditional pre-Wimbledon tournaments) when Roger Federer stepped out on court without something during his doubles match partnering Tommy Haas. Apparently, it's been more than a decade since this has happened.
It didn't help much, as they lost. He said afterwards: "It was fun. A bit naked, but felt good for a change."
He did win the singles, with it. What is "it"?
This day last year: Q.635