Roger Federer retirement question raised after Rafael Nadal sets new Grand Slam record
Greg Rusedski has asked whether Roger Federer would still be playing were it not for his great rival Rafael Nadal, who has pushed the Swiss on throughout his career - and vice versa. Nadal became the first male tennis player ever to win 21 Grand Slams by lifting the Australian Open title on Sunday, leaving Federer and Novak Djokovic behind on 20.


