Nick Kyrgios has pulled out of his scheduled clash with Roger Federer at the BNP Paribas Open due to sickness.
The Australian, ranked 16th in the world, had beaten second seed Novak Djokovic on Wednesday to set up a quarter-final against Federer but was unable to take to the court after a troubled night.
"Unfortunately I am unable to play today due to sickness," he wrote in a statement posted to his Twitter feed. "At this stage we think it's food poisoning, and I'm praying it's nothing more.
"After a restless night of being sick I have nothing left and to play a great champion like Roger, I need to be at my best to have a chance.
"I don't take this decision lightly, these are the matches we train for but I'm in no fit state to take to the court. I'm sorry to the fans but I have to put my health first and I hope you understand.
"I want to wish Roger the best of luck for the rest of the tournament and thank everyone for their support so far here at the BNP Paribas Open. I will definitely be back. Thank you."
Following his win over Djokovic, Kyrgios had been seen raiding a spectator's portion of chips during his doubles quarter-final with Nenad Zimonjic against Lukasz Kubot and Marcelo Melo.