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FILE - In this March 21, 2019 file photo, Bianca Andreescu, of Canada, left, talks with her coach Sylvain Bruneau during her match against Irina Camelia Begu, of Romania, at the Miami Open tennis tournament in Miami Gardens, Fla. Bruneau has released a statement, Sunday, Jan. 17, 2021, saying he was the positive coronavirus case aboard the flight from Abu Dhabi to Melbourne and he had followed all protocols and procedures, including producing a negative test within 72 hours before the flight departure and has "no idea how I might have contracted the virus." (AP Photo/Lynne Sladky, File)

FILE - In this March 21, 2019 file photo, Bianca Andreescu, of Canada, left, talks with her coach Sylvain Bruneau during her match against Irina Camelia Begu, of Romania, at the Miami Open tennis tournament in Miami Gardens, Fla. Bruneau has released a statement, Sunday, Jan. 17, 2021, saying he was the positive coronavirus case aboard the flight from Abu Dhabi to Melbourne and he had followed all protocols and procedures, including producing a negative test within 72 hours before the flight departure and has "no idea how I might have contracted the virus." (AP Photo/Lynne Sladky, File)

Japan's Naomi Osaka arrives at Adelaide Airport ahead of the Australian Open tennis championship, Adelaide, Australia, Thursday, Jan. 14, 2021. Arriving players will serve a 14-day quarantine period ahead of the first Grand slam tennis tournament that is set to get underway on February 8 in Melbourne. (Morgan Sette/AAP Image via AP)

Japan's Naomi Osaka arrives at Adelaide Airport ahead of the Australian Open tennis championship, Adelaide, Australia, Thursday, Jan. 14, 2021. Arriving players will serve a 14-day quarantine period ahead of the first Grand slam tennis tournament that is set to get underway on February 8 in Melbourne. (Morgan Sette/AAP Image via AP)

FILE - In this Jan. 28, 2020, file photo, Tennys Sandgren of the U.S. reacts after losing a point to Switzerland's Roger Federer during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. Sandgren has reportedly been allowed on an Australia-bound flight despite recently testing positive for coronavirus. (AP Photo/Lee Jin-man, File)

FILE - In this Jan. 28, 2020, file photo, Tennys Sandgren of the U.S. reacts after losing a point to Switzerland's Roger Federer during their quarterfinal match at the Australian Open tennis championship in Melbourne, Australia. Sandgren has reportedly been allowed on an Australia-bound flight despite recently testing positive for coronavirus. (AP Photo/Lee Jin-man, File)

Spain's Rafael Nadal, center, arrives at Adelaide Airport ahead of the Australian Open tennis championship, Adelaide, Australia, Thursday, Jan. 14, 2021. Arriving players will serve a 14-day quarantine period ahead of the first Grand slam tennis tournament that is set to get underway on February 8 in Melbourne. (Morgan Sette/AAP Image via AP)

Spain's Rafael Nadal, center, arrives at Adelaide Airport ahead of the Australian Open tennis championship, Adelaide, Australia, Thursday, Jan. 14, 2021. Arriving players will serve a 14-day quarantine period ahead of the first Grand slam tennis tournament that is set to get underway on February 8 in Melbourne. (Morgan Sette/AAP Image via AP)

FILE - In this Tuesday, Jan. 15, 2019 file photo Britain's Andy Murray reacts during a press conference following his first round loss to Spain's Roberto Bautista Agut at the Australian Open tennis championships in Melbourne, Australia. Former world number one Murray's participation at the upcoming Australian Open is in doubt after the Briton tested positive for COVID-19. (AP Photo/Kin Cheung, File)

FILE - In this Tuesday, Jan. 15, 2019 file photo Britain's Andy Murray reacts during a press conference following his first round loss to Spain's Roberto Bautista Agut at the Australian Open tennis championships in Melbourne, Australia. Former world number one Murray's participation at the upcoming Australian Open is in doubt after the Briton tested positive for COVID-19. (AP Photo/Kin Cheung, File)

FILE - In this Monday, Jan. 14, 2019 file photo Britain's Andy Murray reacts after his first round loss to Spain's Roberto Bautista Agut at the Australian Open tennis championships in Melbourne, Australia. Former world number one Murray's participation at the upcoming Australian Open is in doubt after the Briton tested positive for COVID-19. (AP Photo/Andy Brownbill, File)

FILE - In this Monday, Jan. 14, 2019 file photo Britain's Andy Murray reacts after his first round loss to Spain's Roberto Bautista Agut at the Australian Open tennis championships in Melbourne, Australia. Former world number one Murray's participation at the upcoming Australian Open is in doubt after the Briton tested positive for COVID-19. (AP Photo/Andy Brownbill, File)

FILE - In this Monday, Aug. 12, 2019 file photo Andy Murray, of Britain, hits a forehand against Richard Gasquet, of France, during first-round play at the Western & Southern Open tennis tournament, in Mason, Ohio. Former world number one Murray's participation at the upcoming Australian Open is in doubt after the Briton tested positive for COVID-19. (AP Photo/Gary Landers, File)

FILE - In this Monday, Aug. 12, 2019 file photo Andy Murray, of Britain, hits a forehand against Richard Gasquet, of France, during first-round play at the Western & Southern Open tennis tournament, in Mason, Ohio. Former world number one Murray's participation at the upcoming Australian Open is in doubt after the Briton tested positive for COVID-19. (AP Photo/Gary Landers, File)