McEnroe believes Nadal's lack of Grand Slams outside of Paris hinders his legacy.
Federer won a record eighth title at Wimbledon this year making two Grand Slam wins in 2017.
Federer and Nadal have won a combined nine titles in 2017, which include three Grand Slams.
Federer has won 5 of the 7 events he has played in 2017.
Federer is ranked No 3 at the moment, 1,205 points behind top-ranked Murray.
Demands on the sport's finest-ever competitors is greater than ever - when we should be looking after them.
Federer has had a career resurgence this year with five titles including two Grand Slams.
The Swiss won his 19th grand slam title and eighth at SW19 by beating Marin Cilic.
Murray's hip injury flared up during his Wimbledon quarter-final loss to Sam Querrey.
Novak Djokovic, Andy Murray and Rafael Nadal all crashed out of Wimbledon.
Uncle Toni unhappy after Nadal relegated to Court One, where he lost in five sets to Giles Muller.
Organisers insist switching Djokovic vs Adrian Mannarino onto Cente Court would have created a huge safety issue.
Nadal suffered a shock fourth round defeat at Wimbledon to Gilles Muller on Monday (10 June).
World number 26 sees off two-time champion in gripping five-setter on 'Manic Monday' at SW19.
Dimitrov will take on Federer in the fourth round of Wimbledon on Monday (10 July).
Murray dig deep to beat the Italian 6-2 4-6 6-1 7-5.
The Spaniard hinted that his, Federer and Djokovic's success will be hard for the new crop to match.
Young put a good fight but Nadal reigned supreme as he so often does.
Nadal and Federer have played each other 3 times this year with the Swiss master winning on all 3 occasions.
Here's how grunting affects player's performance.
Nadal survived a few minor wobbles to make light work of Millman on Court One.
Tennis' big four have been struggling with various issues in recent months.