We know Nick Kyrgios is one of tennis' most devastating servers.
Turns out, Kyrgios is a sniper returner too.
More: Coric Jabs Kyrgios
After Borna Coric dismissed Kyrgios' criticism of the Adria Tour saying "I don't care" and dissed the outspoken Aussie as "being a general after battle", Kyrgios pulled no punches in a stinging social media response.
Kyrgios questioned if Coric has "rocks in your head," rated the Croatian as intellectually equivalent to a donut and restated his earlier criticism: it's not personal, it's about common sense safety protocol to combat the highly-contagious Coronavirus.
"You should care. Do you have rocks in your head?" Kyrgios tweeted with a link to Coric's comments. "Again, you can stand up for your mates, I’m just trying to hold them accountable. When I said what I said, I didn’t intend to bother. They are tennis players, they aren’t special. Just as I thought Coric intellectual level = 0 (π©)"
The Novak Djokovic-led Adria Tour saw players and fans mingling without masks and exhibit a lack of social distancing.
World No. 1 Djokovic, his wife, Jelena Djokovic, and Tour players Coric, Grigor Dimitrov and Viktor Troicki all tested positive for Coronavirus causing the charity exhibition event's cancellation.
Kyrgios called it "a boneheaded" decision to play the Tour in the first place, criticized participating players for their lack of accountability then called out Alexander Zverev as "selfish" after video of the German partying in a club without social distancing emerged on social media.
In the aftermath of the Adria Tour's cancellation due to the Coronavirus spread, ATP Council Player Council President Djokovic has come under criticism for reckless behavior and lax Adria Tour safety protocol.
Fellow Adria Tour players, including Dominic Thiem and Coric, have defended Djokovic and taken shots at Kyrgios suggesting the sport would be better served if he delivered his criticism privately.
Clearly Kygrios, who has called out Djokovic's "cringeworthy" on-court celebration and taken snarky shots at the Serbian on social media even before the Adria Tour fiasco, has touched a nerve with some Adria Tour participants.
Have we seen the last of the crossfire sniping between these sparring partners?
Time will tell, but given the uncertainty over how many top players will play next month's US Open due to concerns over the Coronavirus safety protocol and potential quarantine issues, it may be several weeks before Kyrgios, Coric, Djokovic, Zverev and Thiem are at the same tournament.
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