Stan Wawrinka returns to ATP top 50

Monfils holds off Wawrinka for Rotterdam title

Swiss marvel Federer still proving himself

Swiss star Federer showing no signs of slowing

My knee flared up – Wawrinka reveals reason for retirement

Djokovic steps up rehab as Federer leads the way

I can't wait for retirement - Federer

New number one Federer revels in 'unbelievable' week

Federer makes short work of disappointing Dimitrov

Federer beats Dimitrov, wins Rotterdam title

Records tumble in Federer's latest remarkable ascent to the top

Federer: Returning to world number one would be crazy