Jannik Sinner appeared set to advance to the third round of the French Open, leading comfortably against Juan Manuel Cerúndolo with a score of 6-3, 6-2, and 5-1. However, in a shocking turn of events, Sinner dropped 11 of the last 12 games, resulting in a stunning defeat. This unexpected collapse has led to discussions about a potential 'major weakness' in Sinner's game, as he left the court visibly shaken. The loss marks another upset in a tournament filled with surprises, raising concerns about Sinner's mental fortitude in high-pressure situations.