Fifth seed Alexander Zverev defeated Borna Coric in four sets to reach the US Open semi-finals on Tuesday.
After pulling out of the US Open, Nick Kyrgios has said that there is a very "slim chance" of him playing in this year's French Open.
Nick Kyrgios hit back at Borna Coric after the latter said he did not care about what Kyrgios' criticism.
Alexander Zverev was heavily criticised after viral footage emerged of him partying in a busy bar despite pledging to "follow self-isolating guidelines" after playing in Novak Djokovic's coronavirus-hit Adria Tour.
Novak Djokovic has been criticised for hosting the exhibition tournament that has led to a slew of players testing positive for coronavirus, including himself.
Viktor Troicki became the third tennis player from Novak Djokovic's Adria Tour tennis tournament to test positive for coronavirus.
Novak Djokovic came under extreme criticism after two players tested positive after playing an exhibition tennis tournament.
Croatian tennis player Borna Coric has tested positive for coronavirus a day after Grigor Dimitrovs positive test led to the cancellation of the Adria Tour final.
Novak Djokovic has now been victorious in 18 ATP matches in a row and in recent months won Wimbledon, the Cincinnati Masters, the US Open and now Shanghai for a fourth time.
Novak Djokovic and Borna Coric kept fans on the edge of their seats with an incredible rally during the first set.
Roger Federer has not been at his best all week, dropping sets in the two opening matches of his wobbly title defence.
Roger Federer also lost the number one spot in ATP rankings to Rafael Nadal, and missed a chance to earn a record 10th title at Halle.
Novak Djokovic needed 10 match points to see off Borna Coric in the Monte Carlo Masters second round on Wednesday, while world number one Rafael Nadal eased past Aljaz Bedene 6-1, 6-3.
The eighth-seeded Borna Coric defeated Marcel Granollers 7-6 (5), 2-6, 6-4 while Ante Pavic beat Nicolas Almagro 3-6, 7-5, 7-6 (1).
Rafael Nadal survived a scare in his opening US Open 2015 match but managed to hold on and win against Croatia's Borna Coric.
Rafael Nadal, who won his second New York title on his last appearance in 2013 before injury forced him to sit out 2014, prevailed 6-3, 6-2, 4-6, 6-4 against his 18-year-old opponent.
Borna Coric heads for the US Open at Flushing Meadows ranked at 35 and poised to hand two-time champion Rafael Nadal yet another reason to wish for 2015 to end quickly.