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.
Roger Federer was officially crowned the oldest world number one on 19 February, it was the first time he returned to the top of the rankings since 2012.
Federer became the oldest world no.1 in tennis history at the Rotterdam Open last week and managed to win his 97th ATP title in Holland.
The International Tennis Federation (ITF) have revealed the player breakdown for tests conducted last season.
Federer recently admitted he is looking forward to retiring, but his former fitness trainer Dorochenko thinks he will be gracing courts around the world for a little while longer.
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.
Safarova, one of the oldest female players on the tour at the age of 31, has praised Federer's evergreen nature.
Being at the top of the men's game has always been important to Federer Jr despite him spending part of 2016 out of the sport.
Benneteau, who like Federer is still competing at major tournaments aged 36, does not think his esteemed counterpart is overly fussed by his position in the ATP rankings.
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.
Federer recently leapfrogged Nadal to become the oldest number one in tennis history, and Annacone is delighted to see his former pupil savour "every little achievement".
Martina Hingis has spoken about Roger Federer's ability to still remain successful despite playing at 36 years of age.
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 certainly showing no signs of fear over retiring from the sport he has dominated for so long.
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.
Miles Maclagan believes the 20-time Grand Slam champion's ability to win matches early gives him a huge physical and psychological advantage.
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.
Richard Krajicek had won the Rotterdam Open on two occasions in 1995 and 1997. Roger Federer has now surpassed the Dutchman to win the tournment three times.
Novak Djokovic's father revealed that he expects his son to return to action at the Madrid Masters in May.
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.
The 36-year-old may have become the oldest world number one ever - but who outperformed him last week?
It will be hard for anyone to surpass Roger Federer and Rafael Nadal in 2018, according to the former's ex-coach.