Novak Djokovic received plenty praise from the tennis community after extending his 2020 winning streak to 20 matches.
But not everyone was impressed by his achievement.
Nick Kyrgios has taken to social media to fire another shot at his Serbian rival following his highly-controversial Adria Tour.
The Aussie tennis star accused Djokovic of lacking "leadership and humility" after he tested positive for coronavirus in the days after the mid-pandemic tournament.
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This week, world No.1 Djokovic silenced his critics as he outclassed Tennys Sandgren at the Western & Southern Open to take his winning streak to 20 games.
The stellar performance had fans posing the question as to whether the 17-time Grand Slam winner could genuinely go unbeaten in 2020.
It's a prospect even Kyrgios can't ignore.
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And the 25-year-old Aussie was quick to heap praise on his rival before laying down some serious criticism.
"Hell of a tennis player. May go unbeaten in 2020, can't take that away from him," Kyrgios tweeted.
"Unfortunately when he was supposed to show some leadership and humility he went missing. Majority would say he has taken an L regardless."
It's not the first time Canberra-born Kyrgios has gone back and fourth with various tennis players online.
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He's locked horns with the likes of Djokovic, Grigor Dimitrov, Borna Coric and Alexander Zverev on social media.
All of which have tested positive for COVID-19 at some stage.
Again, you can understand Kyrgios' frustrations.
Featured Image Credit: PATopics: Tennis, Nick Kyrgios, Coronavirus, Novak Djokovic, Twitter, Australia,
