Pakistan, June 1 -- Iga Swiatek's 25th birthday celebrations turned sour at the French Open on Sunday when the former champion lost to 15th seed Marta Kostyuk in the fourth round and her quest for a fifth title ended just when she had looked to be rediscovering her form.

Swiatek's shock 7-5 6-1 loss came amid a chaotic spell at Roland Garros, with men's world number one Jannik Sinner, 24-times Grand Slam winner Novak Djokovic and defending women's champion Coco Gauff all going out in the previous three days. It leaves world number one Aryna Sabalenka as the favourite to lift her first title in Paris, though Ukrainian Kostyuk will be one to watch as she builds on the momentum that has helped her to sparkle on clay this season.

"I'm still...