Novak Djokovic took the match, but Dustin Brown pegged the fun meter with this behind-the-back beauty in Doha.
Roger, Rafa, Serena and Maria urge peace, love and tolerance in IPTL New Year's video.
The 21-time major champion opted out of her first Hopman Cup assignment, but says she'll be ready for the next.
"Well, that will be amazing," Muguruza said of a mixed doubles partnership with king of clay.
Sharing the court with Sponge Bob, Patrick and Dora the Explorer, Federer goes giant size.
"I feel like if I keep pushing forward it might happen. If not, it’s OK," Federer said of Grand Slam pursuit
"That's why I'm here—to do better than last year," the world No. 1 told the media in Australia.
