Novak Djokovic lost in the first round of the U.S. Open to Argentine Mariano Navone on Monday [2, 3, 4].

The defeat marks a significant disruption to the tournament bracket and halts Djokovic's pursuit of a record-extending 25th major title [4]. As one of the most decorated players in tennis history, his early exit removes a primary favorite from the competition.

The match took place at Flushing Meadows in New York and lasted five sets [1, 2, 3]. Navone, who is 25 years old, played a superior match to secure the victory [2]. Djokovic, a 24-time Grand Slam champion, struggled throughout the contest with his body and the prevailing conditions [1, 5].

Observers said the physical toll on Djokovic was evident as the match progressed. While Navone maintained a high level of play, the Serbian veteran was unable to find the consistency required to overcome the younger opponent [5]. The loss is particularly striking given Djokovic's history of resilience in long matches, a trait that has defined his career.

Reports said that Djokovic was visibly emotional following the conclusion of the match [4]. The upset is one of the most unexpected results of the opening round, shifting the momentum of the 2026 tournament toward a new generation of players.

Navone's victory positions him as a potential dark horse in the draw. By defeating a player of Djokovic's caliber in a grueling five-set battle, the Argentine has demonstrated a level of endurance and skill that will likely make him a formidable opponent in the subsequent rounds [2, 5].

Novak Djokovic lost in the first round of the U.S. Open to Argentine Mariano Navone

This result signals a potential shift in the hierarchy of men's tennis. For Djokovic, the loss highlights the increasing difficulty of maintaining peak physical dominance against younger, high-energy opponents like Navone. For the U.S. Open, the removal of a top seed in the first round opens the draw, creating a vacuum that may allow other contenders to advance deeper into the tournament than originally projected.