World number five Andrey Rublev is the fifth player to test positive for COVID-19 after playing at an exhibition event in Abu Dhabi this month.
Spaniard Rafael Nadal, Canadian Denis Shapovalov, Switzerland's Olympic champion Belinda Bencic and Tunisian Ons Jabeur all tested positive after taking part in the event.
US Open champion Emma Raducanu tested positive in Abu Dhabi before the event and withdrew, while Nadal's coach Carlos Moya also contracted the novel coronavirus.
The 24-year-old Rublev, who beat Andy Murray in the World Tennis Championship final on December 18, confirmed on Twitter he was isolating with minimal symptoms.
"I am currently in Barcelona and unfortunately tested positive for COVID-19," the Russian said. "I am in isolation and following all the protocols under the supervision of doctors.
"As you know, I am fully vaccinated and was preparing for tournaments – ATP Cup and Australian Open. Now I have to recover and I will go to Melbourne only when it will be safe for everyone."
The Australian Open will be held at Melbourne Park from January 17. Rublev was part of the Russian team that won the men's ATP Cup this year and had been included in the team for the upcoming edition in Sydney, which kicks off on Saturday.
New Zealand skittled England's top order on their way to a nervy two-wicket win in the third one-day international on Saturday to sweep the series 3-0 and send the tourists off to Australia with some concerns about their batting.
The Turkish Football Federation (TFF) suspended 149 referees and assistant referees on Friday after an investigation found the officials working in the country's professional leagues were allegedly betting on football matches.
A Josh Hazlewood masterclass with the ball and a batting blitz by Mitchell Marsh carried Australia to a dominant four-wicket win in the second T20I against India at the Melbourne Cricket Ground on Friday.
India ended Australia's title defence and booked their place in the ICC Women's World Cup final against South Africa after Jemimah Rodrigues smashed an unbeaten 127 to secure their thrilling five-wicket victory in the second semi-final on Thursday.
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Make sure to tune in every weekdays to Tag Gising Na from 5AM - 10 AM for a comprehensive roundup of important updates.