Who has become the oldest player in the world to hold number 1 rank in the ATP world rankings?

Who has become the oldest player in the world to hold number 1 rank in

1.	Who has become the oldest player in the world to hold number 1 rank in the ATP world rankings?
Answer» Roger Federer has become the oldest player in the world to hold number 1 rank in the ATP world rankings. Roger Federer achieved this feat by defeating Robin Haase 4-6 6-1 6-1 to reach semi-finals of the ABN AMRO tournament in Rotterdam on 16th February 2018. He reached number one position for the first time in 2004. He has surpassed America's Andre Agassi, who was the previous oldest player to be world number one at 33 years in 2003.