Switzerland's Roger Federer reacts as he speaks to the audience after victory over Netherlands Robin Haase in their quarter-final singles tennis match for the ABN AMRO World Tennis Tournament in Rotterdam on February 16, 2018. Roger Federer became the oldest world number one on February 16, 2018, when the 20-time Grand Slam title winner reached the semi-finals of the Rotterdam Open. The 36-year-old Swiss overcame an early setback to beat Robin Haase of the Netherlands 4-6, 6-1, 6-1 and will replace old rival Rafael Nadal at the top of the rankings. / AFP PHOTO / JOHN THYS