Nick Kyrgios says it was a "bone-headed decision" to go ahead with the Adria Tour after Grigor Dimitrov and Borna Coric tested positive for coronavirus.
Bulgarian world number 19 Dimitrov, 29, withdrew from the tournament in Zadar, Croatia, on Saturday with sickness after losing to 23-year-old Croatian Coric, who played again on Sunday.
The series of events is hosted by world number one Novak Djokovic.
"Boneheaded decision to go ahead with the 'exhibition'," Kyrgios said.
With Croatia easing lockdown measures before the event, players were not obliged to observe social distancing rules and were seen embracing at the net at the end of their matches.
Pictures on the tournament's social media from three days ago show Dimitrov playing basketball with Djokovic, Zverev and Marin Cilic, while he also put his arm around Coric before their match.
Australian Kyrgios added: "Speedy recovery fellas, but that's what happens when you disregard all protocols. This is not a joke."
Djokovic's agent confirmed on Monday that the Serb had not yet been tested, but would have a test.
The Zadar tournament was the second Adria Tour event after the opening round in Belgrade, Serbia.
Sunday's final, which would have featured Djokovic, was cancelled.
"I am so sorry for any harm I might have caused," Dimitrov, who also played in the Belgrade event last week, wrote on Instagram on Sunday.
"I tested positive back in Monaco for Covid-19. I want to make sure anyone who has been in contact with me during these past days gets tested and takes the necessary precautions.
"I am back home now and recovering. Thanks for your support and please stay safe and healthy."
On Monday, Coric revealed he had also tested positive, saying: "I'm feeling well and don't have any symptoms. Please stay safe and healthy!"
The tournaments were set up by world number one Djokovic to help players get back to match fitness after several weeks without competition because of the coronavirus pandemic. Several top-10 players have been competing, including Djokovic, Alexander Zverev and Dominic Thiem.
The first event in Serbia attracted 4,000 fans, and several thousand attended in Croatia.
Djokovic's coach and event director Goran Ivanisevic told fans courtside the final was off because of Dimitrov's positive test.
Tournament organisers said the final was cancelled "as a precaution and to protect the health of all participants and visitors".
A statement read: "At all times we have strictly followed the epidemiological measures in place with the countries where the Adria Tour was organised.
"None of the people involved in the organisation and who have been in contact with Grigor have any symptoms.
"However, we are in close contact with health authorities in order to ensure that all people who were in contact with Grigor will be tested tonight. Since we do not want to risk, we decided to cancel the final match."
There have been no professional tennis events organised by the main men's and women's tours since March because of the coronavirus pandemic.
The US Open will be held without fans from 31 August to 13 September, despite some players voicing concerns about travelling to New York.
Latest Stories
-
Sports facilities are better managed by institutions – UG Sports Director on maintenance of Legon stadium
11 mins -
Ghanaian businesses must align vision with strategy to mitigate ESG Risks – KPMG
22 mins -
MTN achieves 30% localisation of Scancom PLC
23 mins -
Attorney-General: Some lawyers sacrifice ethics for ‘cheap’ political gains
34 mins -
Bond market: Volume up by 12.45% to GH¢746m
35 mins -
Cedi records year-to-date loss of nearly 29%; one dollar going for GH¢17.10
43 mins -
‘Our priorities are wrong in Ghana’ – UG Sports Director on sports development
43 mins -
The Fourth Estate’s investigative report wins 2nd place at 2024 AIJC
1 hour -
GPL: Our fans spur us on – GoldStars head coach Frimpong Manso on unbeaten run
2 hours -
Plantain chips are breaking hearts in Africa
2 hours -
61 new architects acquire state license to practice in Ghana
2 hours -
Masloc CEO honoured as capacity building Shero of the Year
2 hours -
MPs’ Repeated Attempts to Sue the Speaker: Unintended Consequences for the 2024 Elections?
2 hours -
Today’s front pages: Tuesday, November 5, 2024
3 hours -
Galamsey: Investigation into attack on Joy News’ Erastus Asare and colleagues already growing cold
3 hours