Grigor Dimitrov has credited world number one Rafael Nadal for helping turn his season around after the duo trained with each other in Mallorca.
Roger Federer was a contender for the year-end world number one spot but was beaten to it by long-time rival Rafael Nadal.
Former world number one Mats Wilander believes despite the lack of success for the next generation, the experience of playing Rafael Nadal and Roger Federer will prove crucial.
Roger Federer has continued what has been a remarkable year after becoming the top prize money in all of individual sports.
Federer backed Zverev, Shapovalov and Kyrgios to emulate members of the current big four after his win over Zverev at the ATP Finals in London.
World number one Rafael Nadal is in danger of missing out on the 2018 Australian Open after pulling out of the ATP Finals due to a recurring knee injury.
Rafael Nadal's decision to play the ATP Finals in London has been questioned after he was forced to withdraw after just one match.
Former British number one Annabel Croft believes Roger Federer will only retire when he stops enjoying the sport of tennis.
Roger Federer holds the record for the most number of Grand Slam titles and number of weeks as the No.1 but has a poor head-to-head record against his longtime rival Rafael Nadal.
Rafael Nadal has withdrawn from the ATP World Tour Finals after his knee injury flared up during his loss to David Goffin on Monday (13 November).
Roger Federer was favourite to become world No1 going into the second-half of the campaign until he suffered a back injury during the Montreal Masters.
Andy Murray lost the match 6-3, 3-6, 10-6 against Roger Federer but was delighted to have made a successful comeback four months after ending his 2017 campaign due to a hip injury.
Roger Federer does not agree with Rafael Nadal's viewpoint that the ATP Finals in London should be played on clay.
Roger Federer revealed that he feels fully fit after coming through unscathed in his first group stage win over Jack Sock at the ATP Finals in London on Sunday, 12 November.
Marin Cilic has given his assessment on whether Rafael Nadal and Roger Federer benefited from the 2017 absences of Novak Djokovic and Andy Murray.