The 18-time major champion says that Madison Keys is the real deal.
The former Wimbledon champ will compete in the doubles this year after receiving a wild card.
Team Santina will be back in Singapore looking to defend their title in October
Reigning champion Serena Williams is highly motivated to win her first major title since the 2015 Wimbledon.
Coach calls Murray's hiring of Mauresmo both "strange" and "courageous."
World No. 8 may also partner Wawrinka in mixed doubles.
"Is (Djokovic) beatable? Yes, of course he is. I beat him last year three times,” Federer says in new interview.
