Australia's Nick Kyrgios has pulled out of his quarter-final against Roger Federer at Indian Wells because of a bout of food poisoning.
The 21-year-old, seeded 15th, beat world number two Novak Djokovic in the previous round, but will not now face Australian Open champion Federer.
"At this stage we think it's food poisoning, and I'm praying it's nothing more," Kyrgios said in a statement.
Federer, 35, goes on to face Japan's Kei Nishikori or Jack Sock of the US.
More to follow.