Federer skipped the entire clay court swing of the season last year following a blistering start.
Roger Federer and Grigor Dimitrov could face each other for the seventh time if they win their respective semi-final clashes at the 2018 Rotterdam Open.
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.
A Twitter user pretending to be a rising tennis star managed to prank the BBC, Serena Williams and Martina Navratilova.
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.