Dalila Jakupovic was forced to retire from Australian Open qualifiers because of the "unhealthy" air quality in Melbourne.
She collapsed with a coughing fit and was unable to finish her service game despite leading 6-4 5-6 against Switzerland's Stefanie Vogele.
"I was really scared," Slovenian Dalila Jakupovic told the media. "I never had breathing problems. I actually like heat. But ... I just couldn't breathe anymore and I just fell on the floor."
Former Wimbledon finalist Eugenie Bouchard and Australia's Bernard Tomic also required medical timeout during their games.
A thick haze from the raging wildfires has enveloped Melbourne, leaving air quality in the "very poor" to “hazardous” range.
Meanwhile, Australian Open said it will make further decisions about the matches after consulting with its medical team, the Bureau of Meteorology and scientists from the state’s Environment Protection Authority.
Coventry City ended their 25-year absence from the Premier League with a 1-1 draw at Blackburn Rovers, securing promotion from the Championship with three games to spare on Friday.
Carlos Alcaraz will miss the Madrid Open for the second consecutive year after withdrawing on Friday with a wrist injury, dealing another blow to the world number two's clay court preparations ahead of his French Open title defence.
Novak Djokovic is still working through the injury problems that forced him to miss recent tournaments in Miami and Monte Carlo and said on Friday that he will not feature at next week's Madrid Open, one of the last stops before the French Open.
Mumbai Indians head coach Mahela Jayawardene has defended Jasprit Bumrah after the struggling pace spearhead went a fifth Indian Premier League match without a wicket in Thursday's seven-wicket defeat by Punjab Kings.
Iranian women's football players Fatemeh Pasandideh and Atefeh Ramezanisadeh thanked the Australian government on Friday for offering a "safe haven" and said they wished to resume their sporting careers after rebuilding their lives.
Dubai Police, in collaboration with the UAE Ministry of Interior, have arrested an Irish fugitive accused of involvement in an organised criminal group linked to international crimes in his home country.
UAE President His Highness Sheikh Mohamed bin Zayed Al Nahyan has met with His Highness Sheikh Hamad bin Mohammed Al Sharqi, Supreme Council Member and Ruler of Fujairah, to discuss national priorities and the country’s continued development.