Roger Federer is still 'scared' by the knee injury that forced him to bring an end to his storied tennis career.
The Swiss icon admitted he was forced to finally 'listen to his body' after announcing his retirement before the Laver Cup in September. Federer had spent almost two years sidelined by knee issues, and realised he 'stopped believing' over a return to his elite levels after a scan on his ongoing problem.
The 20-time Grand Slam champion underwent knee surgery for a third time during his 14 months away from the court, and ultimately decided to wave an emotional goodbye as he paired up with close friend and great rival Rafael Nadal for one final match at the 02 Arena.
