Novak Djokovic admits 'serious issue' as Serb breaks silence on US Open upset
Novak Djokovic admitted to having a "serious issue" with vomiting during matches after his US Open defeat at the hands of Mariano Navone. The veteran Serb was dumped out in a huge early shock as he slipped to a crushing 7-6 5-7 4-6 6-2 6-1 loss. He struggled throughout the contest, vomiting several times and breaking down in tears at one point.Djokovic was also forced to deal with cramps as the match progressed, allowing Navone to take full control of the final two sets. The result marked Djokovic's earliest Grand Slam exit in two decades and will see him slip outside the world's top 10 when the ATP rankings are updated.

TL;DR
- Novak Djokovic admitted to experiencing vomiting during his US Open match against Mariano Navone.
- He described the vomiting as a 'serious issue' that has occurred in most matches this year.
- The physical struggles, including cramps and pain, led to his early exit from the tournament.
- This loss is Djokovic's earliest Grand Slam exit in two decades and will cause him to drop outside the top 10.
- Djokovic considered giving up during the match but decided to finish after winning a set.
- He expressed uncertainty about how to solve the issue and how much longer he can continue playing under these conditions.