Rafael Nadal

The Swiss world number one has until 12pm EST [5pm GMT] to decide whether to play his third tournament of 2018.

Federer became the oldest player in the game to claim the number one title when he reached the semi-finals of the Rotterdam Open.

Roger Federer's wife Mirka created a "bubble" for Federer which allowed him to concentrate only on tennis.

The 12-time grand slam champion continues to work with a resistance band as his rehabilitation advances further.

Roger Federer's father Robert believes his son's reign as the oldest world number one could be over soon depending on how well Rafael Nadal plays upon his return.

Roger Federer becane the oldest world number one in ATP history following his win over Robin Haase at the Rotterdam Open.

Roger Federer has won nine titles in the last 13 months which include three Grand Slams to get back to world number one after over five years.

Roger Federer went over four years without a major title between his win at the 2012 Wimbledon Championships and the 2017 Australian Open title.

Roger Federer has been hailed as the complete player by former opponent Rainer Schuettler after becoming the oldest world no.1 in tennis history.

Federer is enjoying a remarkable twilight of his career and is still breaking records as he approaches his 37th birthday.

Mats Wilander believes Roger Federer's recent success along with his career resurgence from last year prove he is the best tennis player over Rafael Nadal.

Federer skipped the entire clay court swing of the season in 2017 including the French Open, but indicated that he will play a limited schedule this season.

The Spaniard returns for the first time since his Australian Open quarter-final withdrawal last month.

At the time Sampras had 13 career Grand Slams to his name and was heavy favourite to win Wimbledon that year.

Roger Federer dropped just one set on course to the Rotterdam Open title and it was in the quarter-finals against Robin Haase.

The Spaniard will not directly target usurping Federer as he enters "important" period of the season starting at the Mexican Open.

It will be hard for anyone to surpass Roger Federer and Rafael Nadal in 2018, according to the former's ex-coach.

Federer won the Rotterdam Open after beating Cilic in the Australian Open, picking up his 97th title in his illustrious career.

Federer decided to play less, change his racquet, shorten his matches and play even more forward so as to not exert himself beyond his capacity.

Federer has made history by becoming the oldest world number one, eclipsing the record set by Andre Agassi way back in 2003.

Federer leapfrogged Nadal in the world rankings after reaching the semi-finals of the Rotterdam Open.

Andre Agassi has revealed which players he feels are capable of challenging Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray.

Federer became the oldest world number one in tennis following his quarter-final victory over Robin Haase at the Rotterdam Open.

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.

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.