Grigor Dimitrov, another competitor at the event, on Sunday became the highest-profile tennis player to reveal he has been infected by the virus.
The final of the event in the Croatian coastal resort of Zadar was cancelled as a result.
"Hi everyone, I wanted to inform you all that I tested positive for Covid-19," Coric, 23, said on his official twitter account. "I'm feeling well and don't have any symptoms."
— borna coric (@borna_coric) June 22, 2020
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