Novak Djokovic has raised concerns after delivering a worrying update following multiple incidents in Shanghai.
This week, Djokovic, 38, is looking to win the ATP1000 event in Shanghai, China.
With Carlos Alcaraz deciding to skip the tournament and Jannik Sinner forced to retire due to cramp, Djokovic has a big chance to win his first Masters 1000 title in almost two years.
Earlier in the tournament, Djokovic was spotted throwing up on multiple occasions against Yannick Hanfmann and Jaume Munar.
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The Serbian was struggling due to the weather conditions in Shanghai, with humidity levels reaching close to the 80 per cent mark during the week.
During his win over Munar, Djokovic was seen lying flat on his back on the court immediately after dropping the second set.
After getting his vitals checked by the doctor, Djokovic dug deep to seal a hard-fought victory.
On Thursday, the 24-time Grand Slam champion advanced to the semi-finals after beating Zizou Bergs.
Speaking after the match, Djokovic stated that something was “happening with the body” in every match he has played.
He said: "I assure you it wasn't easy. No win is easy at this level. Zizou Bergs has been playing some terrific tennis this tournament. I think it would be disrespectful towards him to say it was easy. It was a tough-earned victory in two sets.
"My leg was good. There's always something happening with the body pretty much every match that I play right now. There's some other issues that I'm trying to address day by day, and hopefully it's going to get better as the tournament progresses."
Djokovic added: "I have a day off to my semi-final, so that's really good. Yeah, I'm going to come back with, of course, the right attitude and intention to win."
On Saturday, Djokovic will take on world number 204, Valentin Vacherot, who beat the likes of Holger Rune, Tomas Machac and Alexander Bublik in previous rounds.
The governing body of men's tennis, ATP, released a statement after Rune urged them to take action regarding the playing conditions earlier this week.
It read: "Under ATP rules, decisions regarding the suspension of play due to weather conditions – including extreme heat – lie with the on-site ATP supervisor, in coordination with on‑site medical teams and local authorities.
"In parallel, the ATP medical services team implements several measures in cases of extreme heat, to help protect player health during competition.
"This remains under active review and additional measures including the implementation of an official heat policy are currently being evaluated in consultation with players, tournaments, and medical experts. Player safety remains a top priority for the ATP."
Topics: Novak Djokovic, Tennis
Marcus Chan