The Briton was overcome with emotion after beating Marius Copil at the Citi Open.
The American beat hometown favorite Andy Murray in a Wimbledon quarterfinal on Wednesday.
Research shows top players grunted at a higher pitch in matches they lost.
The big four have dominated the men's singles game at SW19.
Murray begins his defense on Monday in London.
Djokovic faces Dominic Thiem in the quarterfinal at Roland Garros.
Court refused to fly on Qantas due to its support of same-sex marriage.
Tennis' only clay major is finally attempting to modernize.
The Briton has suffered with injury this year.
The Swiss wants to concentrate on the grass-court season.
They last met in a Grand Slam final in 2011.
Djokovic was the second seed in Melbourne.
Federer has not played a Grand Slam since Wimbledon 2016.
Wawrinka won his first Grand Slam at 28.
This is Murray's first Grand Slam as world number one.
Wawrinka, the world number four, has a good head-to-head record against Murray.
Djokovic is coached by Becker.
By certain metrics, Novak Djokovic has had the better year.
If Nadal, Federer and Djokovic were sporting hares, Murray is a tortoise.
'It's been such a difficult thing to do during my career because of how good the guys around me have been, the guys ahead of me,' Murray said.
Murray was beaten in the final by Djokovic in 2015.
Murray is currently competing in the China Open.
The 22-times Grand Slam winner was troubled by a knee injury.
The Jamaican sprinter proved his class again.