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.

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Roger Federer becomes oldest world No. 1 after beating Robin Haase

Roger Federer returns to top of ATP rankings; oldest ever at 36 - ESPN

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Roger Federer by the numbers: 5 career tennis records in his

Roger Federer announces retirement – The Ticker

Roger Federer is 36 and No. 1, and he may be playing his best

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

Roger Federer wins Indian Wells quarter-final to retain world No 1