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 – Official Signed Postcard – Roland Garros 2019 BAS

Roger Federer Biography: Personal Life, Career and Achievements

Top of the world: Federer, 36, becomes oldest number one

Roger Federer says he is retiring from tennis

Roger Federer Announces Plans to Retire From Tennis - The New York

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

Roger Federer Is Still Game at 33 - The New York Times

Roger Federer – Official Signed Postcard - SignedForCharity

Roger Federer Becomes the Oldest World Number 1

Roger Federer – Official Signed Postcard - SignedForCharity

Roger Federer, Riding High, Isn't Underestimating Hyeon Chung

Can Roger Federer find his old form in 2014?

Roger Federer: The second 40-something to rank in the Top 10

Roger Federer to retire from tennis : NPR

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