Roger Federer, 36, aims to become oldest world No.1 tennis player

Roger Federer will play in the ATP 500 event in Rotterdam  - if he makes it to semi-finals, he will have a chance to become the oldest world number one tennis player in history.

Roger Federer says he is retiring from pro tennis at age 41

Rotterdam Open: Roger Federer aims to become oldest World No 1

Roger Federer overpowers Grigor Dimitrov to win 97th career title

Roger Federer, after 20 Grand Slam titles, announces retirement

Roger Federer is retiring from tennis -- but his mark on the sport

The day Roger Federer beat his own record of the oldest player to

Roger Federer Pursues the No. 1 Ranking Again. Why Not? - The New

Ageless Roger Federer rides his time machine back to top of ATP

Roger Federer says he is retiring from tennis - Washington Times

Roger Federer – Official Signed Postcard - SignedForCharity

Roger Federer Retires with $1.1 Billion in Career Earnings