Manchester City boss Pep Guardiola is unsure how long their rivalry with Liverpool will last.
City host Liverpool on Sunday.
Guardiola said, "Nadal, Federer and Djokovic was 20 years and we are five years.
"Footballers run quicker and to maintain success is more difficult than other sports.
"When I remember my period here and watch and play golf I remember here the biggest rivalry was Liverpool. When you achieve 100 points and 98 points you need someone to push from behind to be so close. You have to make another step.
"Our chairman and CEO, we want to grow. I'm sure Liverpool and other teams are going to try to do it.
"The most credit I give is consistency through the years. Both have had four or five years.
"That's why Federer, Nadal, Djokovic have been at the top for so long.
"Arriving at these stages to win the titles, we try to do it."
Guardiola was asked if he's have a glass of wine with Reds counterpart Jurgen Klopp after the game on Sunday.
"If we win I'd love it. I'll invite him! Jurgen makes world football a better place to live.
"A huge competitor, I think it's good. He knows, we spoke together in Germany, the message and the way his teams play.
"He's a good guy and I don't have any problems with him."
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