NextGenATP Spaniard Martin Landaluce: Argentina's Juan Manuel Cerundolo cause a huge sensation in the French Open on Thursday, by stunning World No.1 Jannik Sinner in the second round, ending ’the Italian star's attempt to complete the Career Grand Slam in a physically-draining 3-6, 2-6, 7-5, 6-1, 6-1 defeat at Stade Roland Garros in Paris.
Sinner appeared on course for victory when he led 5-1 in the third set of his second-round match, but he soon began to appear to struggle with cramp in a dramatic turn of events. The 24-year-old Italian twice failed to serve out the match and also required an off-court medical timeout at 5-4, 0/40.
From that moment, Sinner was unable to recover his physical condition, and Cerundolo took full advantage, claiming 18 of the final 20 games to seal the biggest upset of the 2026 season so far. The Argentine, who is competing as the World No. 56, is the first man to oust the top seed at the clay-court major before the third round since Karol Kucera in 2000.