Federer will now face Grigor Dimitrov in the final on Sunday (18 February), but Rotterdam Open glory will not overshadow his reprisal of the world No 1 ranking on Friday.
Roger Federer became the oldest world number one after reaching the semi-finals of the Rotterdam Open in remarkable fashion.
Federer has beaten all odds at the age of 36 despite people writing off his chances to make the top of the ATP rankings.
Roger Federer has not lost in 2018 having defended his crown at the Australian Open and is now in the semi-finals at the Rotterdam Open.
The Swiss ace came from being a set down to beat Robin Haase in the quarter-finals of the Rotterdam Open.
Marin Cilic lost to Roger Federer at the 2017 Wimbledon final and 2018 Australian Open final. Tracy Austin believes Cilic can finish the year as the new No.1 if he is consistent.
Roger Federer became the oldest world number one in tennis after his quarter-final win over Robin Haase at the Rotterdam Open.
Roger Federer defeated Robin Haase in the quarter-finals of the Rotterdam Open to become the oldest world number one.
The 35-year-old Swiss legend eclipses Andre Agassi as the oldest No.1 in tennis history after overcoming Robin Haase.
The German has all the tools required to win multiple major titles, according to Andy Murray's former coach.
Federer is looking forward to becoming the oldest World No 1 eclipsing Andre Agassi's record at Rotterdam.
Federer's remarkable Indian summer will be made even more astounding if he manages do what's expected of him and become world No 1 for the first time in over five years.
Roger Federer will become the world number one if he beats Robin Haase in the quarter-finals of the Rotterdam Open on Friday (16 February).
The Madrid Masters has been penciled in as the Serbian's next appearance after some setbacks in his recovery.
Roger Federer will beat Rafael Nadal to the number one spot should he make it to the semi-finals of the Rotterdam Open.
Roger Federer, Rafael Nadal and Novak Djokovic have dominated the men's game for more than a decade.
Federer played Ruben Bemelmans on 14 February, dismantling him in straight sets, 6-1 6-2, in a game which lasted just 46 minutes.
Roger Federer defeated Philipp Kohlschreiber 7-6, 7-5 to progress to the quarter-final of the 2018 Rotterdam Open.
Roger Federer has taken a stop closer to reclaiming the world number one ranking after beating Philipp Kohlschreiber to reach the quarter-finals of the Rotterdam Open.
The 20-time grand slam winner could yet play at the Dubai Tennis Championship despite accepting a wild card to play in Rotterdam.
Courier, a former world No.1 himself, is simply amazed by the level the 20-time Grand Slam champion is managing to sustain during the twilight of his career.
Reaching 100 ATP titles is among the 36-year-old's targets during the remaining years of his career as he chases a return to number one.
