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.
Paris St Germain picked up where they left off following last season’s Champions League triumph as they kicked off their new campaign with an impressive 4-0 win over Atalanta at the Parc des Princes on Wednesday.
Liverpool captain Virgil van Dijk headed home a last-gasp goal in stoppage time to lead Arne Slot's men to a thrilling 3-2 victory over Atletico Madrid in the opening game of their Champions League campaign on Wednesday at Anfield.
Pakistan delayed their match against the UAE by an hour on Wednesday after considering a withdrawal from the Asia Cup in protest at a match referee whom they say condoned unsportsmanlike behaviour by India at the weekend.
Portuguese club Benfica are set to name Jose Mourinho as its head coach following the sacking of Bruno Lage in the aftermath of their 3-2 Champions League defeat by Qarabag, Portuguese TV station RTP reported on Wednesday.