Rafael Nadal opened his Madrid Open campaign with a dominant 6-3 6-1 victory against Gael Monfils to maintain his flawless clay court campaign this season.
"Well, there is a problem with today's society, that to be a true supporter of one team, it seems that you have to be anti another team", Nadal told reporters on Monday, after arriving in the Spanish capital to participate in the Madrid Open, AP reported.
The world No 1 also needs to ensure he retains his Madrid Open title to stop Roger Federer leapfrogging him in the world rankings.
"I just knew that if I put myself in the match hopefully in the closing stages I would give myself a chance". I do not worry about this at all.
"I think it's definitely a surface that evens out a lot of the playing field".
If Nadal can overcome Diego Schwartzman in straight sets during his next match in Madrid, the Spaniard will equal the feat that McEnroe managed more than three decades ago on carpet.
"The process is very simple for me: I analyze every day the things that happened and try to fix things", Nadal said.
"I was looking forward to having these kind of matches, looking to trying to win these kind of matches", Djokovic said.
"I have to get into the game well, try not to make a big difference and not everything is favourable to him". I think that I have another tough match tomorrow, I can go on court and win or lose. [I'm] pleased with the way my game's developing, that I'm able to beat a player like that.
Djokovic, who kicked off his campaign with straight sets win over Japan's Kei Nishikori, failed to bounce back from a set down and slumped to a 3-6, 6-2, 3-6 defeat against Edmund.
"Then I really set up a good opportunity for me to step up".
"I was very aggressive, played deep, returned a lot better".
He will now take on Argentine No. 13 seed Schwartzman, who defeated fellow Spaniard Feliciano Lopez 7-5, 2-6, 6-2, in the third round to book his place in the quarter-finals.
Frenchman Lucas Pouille, seeded 15th, crashed out of the tournament after a 6-2 6-3 defeat by compatriot Benoit Paire.