Nick Kyrgios has slammed Novak Djokovic as "a tool" after the world No.1 issued a fanciful wish-list for Australian Open players in hard quarantine.
Kyrgios also said that the girlfriend of fellow Australian player Bernard Tomic, Vanessa Sierra, had "no perspective" on the ongoing fight against COVID-19.
Kyrgios was responding to a news video on Twitter, related to Djokovic's quarantine demands when he simply wrote: "Djokovic is a tool."
After Sierra complained about the conditions of her quarantine with Tomic, Kyrgios wrote: "I don't mind Bernie but his Mrs obviously has no perspective, ridiculous scenes."
Nick Kyrgios and Novak Djokovic.
In a social media video, Sierra branded quarantine food "s--t" and claimed that she had been forced to wash her own hair - something that she'd "never done" before.
"This is the worst part of quarantine: I don't wash my own hair. I've never washed my own hair. It's just not something that I do. I normally have hairdressers that do it twice a week for me, so this is the situation that we're dealing with," said Sierra, a former Love Island contestant.
Sierra also said that she and Tomic were playing video games for up to 11 hours per day during their 14-day lockdown. Tomic was on the COVID-19 affected plane from Abu Dhabi, having travelled back to Australia after successfully playing in the Open qualifying event in Doha.
Bernard Tomic and Vanessa Sierra.
Djokovic was unaffected by the hard lockdowns that have impacted 72 players but issued a wish-list of improved conditions on their behalf. Some items on the list were entirely reasonable, such as better food and access to training equipment, yet he also suggested that lockdown could be shortened and players moved to private homes with tennis courts.
"Novak wrote a note - these weren't demands, they were suggestions," Australian Open tournament director and Tennis Australia CEO Craig Tiley told TODAY on Tuesday.
"But he too is understanding what two weeks of lockdown means. Our objective right from the beginning and we've never wavered from that in partnership with the Victorian Government, is to ensure the safety of the community."
Djokovic's list was met with a firm "no" from Victorian Premier Daniel Andrews and now mockery from Kyrgios.
Novak Djokovic waves as he arrives at Adelaide Airport.
Tennis Australia CEO Craig Tiley has addressed Australian Open quarantine problems and Novak Djokovic's controversial wish-list.
Kyrgios and Djokovic have had a long-running battle, preceding the COVID-19 pandemic. The feud has escalated in the past year, with Kyrgios an outspoken advocate of observing coronavirus biosecurity protocols and Djokovic infamously lax.
Djokovic's quarantine wish-list was especially jarring given his organisation last year of the Adria Tour. The event occurred while the professional tennis tours were inactive due to COVID-19, yet featured-packed crowds with no masks or social distancing.
Djokovic, seen partying shirtless in a nightclub with other players during the event, contracted COVID-19, as did his wife Jelena.