Novak Djokovic, the No. 4 seed at the US Open, encountered significant challenges during his opening match against an unseeded challenger. Reports indicate that Djokovic showed signs of illness, including dehydration, and was seen vomiting multiple times during the contest. This unexpected struggle adds a layer of complexity to Djokovic's campaign as he seeks to navigate through the tournament. His resilience will be tested as he aims to overcome these physical issues while competing at one of the sport's most prestigious events.