‘Health Issue’: Novak Djokovic’s Big US Open Concern as 25th Grand Slam Chase Begins

Novak Djokovic arrives at the US Open 2026 with history within reach, but the biggest obstacle may not be a rival across the net. Instead, the 39-year-old Serbian faces questions over whether his body can withstand the demanding conditions of another two-week Grand Slam campaign. Djokovic is chasing a record 25th Grand Slam title, which would move him clear of Margaret Court's 24 major singles titles on the all-time list. He has already won the US Open four times and reached a men's-record 10 finals in New York. But his recent struggles in Cincinnati have added an unexpected layer of uncertainty to his Novak Djokovic US Open chances.

Djokovic Opens Up About a Longstanding Health Issue

The concern became clear during Djokovic's Cincinnati Open defeat to Argentina's Thiago Agustín Tirante. After winning the opening set comfortably, Djokovic began to struggle physically as the heat and humidity intensified. He eventually required medical attention and lost the match 2-6, 6-4, 6-4 after two hours and 44 minutes. Speaking afterward, Djokovic revealed that he has been dealing with a health condition for several years and that hot, humid conditions make the problem considerably worse. The revelation immediately put his physical condition under the spotlight ahead of the final Grand Slam of the season.

Heat and Humidity Could Be Djokovic's Biggest Test

New York's late-summer conditions can be brutal for players, particularly during long afternoon matches. High temperatures, humidity and hard courts can turn an ordinary three-set match into a serious physical examination. For Djokovic, this is particularly important because the US Open requires a player to win seven matches to lift the trophy. If several contests become long and physically demanding, managing his energy will become just as important as his tennis. Reuters noted that Djokovic's Cincinnati experience offered a reminder of the physical margin he now has to manage at 39. The Serbian's remarkable ability to recover between matches remains one of his greatest strengths, but age inevitably changes the equation.

Cincinnati Was a Warning Sign

Djokovic's defeat to Tirante was not simply another early loss. It provided a glimpse of the challenge he could face in New York. He dominated the opening set 6-2 and appeared to be heading toward a routine victory. But the conditions began taking their toll as the match progressed. Djokovic struggled physically, requested a medical timeout and ultimately could not maintain his level. The ATP Tour reported that the Serbian visibly struggled from around the middle of the match and said afterward that the health condition had been bothering him for years, particularly in heat and humidity. That makes the US Open environment especially significant.

Djokovic Has Already Shown He Can Still Go Deep

Despite the concerns, it would be a mistake to write Djokovic off. His 2026 Grand Slam season has demonstrated that he remains capable of competing at the highest level. He reached the Australian Open final after defeating Jannik Sinner in a five-set semi-final and later reached the Wimbledon semi-finals. His experience is also unmatched by most of the players in the draw. Djokovic knows exactly what it takes to navigate the pressure of a Grand Slam, particularly in New York. The challenge now is whether his physical condition allows his world-class tennis to remain on court for the full tournament.

The Race for 25 Makes This US Open Different

The Djokovic 25th Grand Slam storyline adds enormous weight to the tournament. A 25th major would give him sole possession of the all-time Grand Slam singles record, ending his tie with Margaret Court. It would also be his first Grand Slam title since winning the US Open in 2023. That means Djokovic is not simply playing for another trophy. He is chasing a piece of tennis history that could define the final stages of his career. The pressure will be immense, but Djokovic has repeatedly demonstrated that he thrives in high-pressure situations.

Jannik Sinner's Absence Opens the Door

Djokovic's path has also become more attractive because world No. 1 Jannik Sinner has withdrawn from the tournament with a right-knee injury. That removes one of the most difficult potential obstacles from Djokovic's route to the title. Sinner has beaten Djokovic several times at recent Grand Slam tournaments, making his absence particularly significant. However, the field is still dangerous. Defending champion Carlos Alcaraz is returning after a lengthy absence caused by a wrist injury, while Alexander Zverev, Ben Shelton, Taylor Fritz and several other contenders will be capable of making a deep run.

Carlos Alcaraz Remains a Major Threat

If Djokovic reaches the latter stages, Carlos Alcaraz could once again stand in his way. The Spaniard defeated Djokovic in last year's US Open semi-final and also beat him in the 2026 Australian Open final. Alcaraz enters the tournament with his own fitness questions after a long injury layoff, but his ability to generate explosive rallies and maintain intensity makes him one of Djokovic's biggest potential threats. The possibility of another Djokovic-Alcaraz showdown adds another layer of intrigue to the tournament.

Experience Could Be Djokovic's Greatest Weapon

While the Novak Djokovic health issue is a concern, his experience could help him manage it better than almost anyone else. Djokovic has spent years adapting his schedule, training and recovery routines to maximise his performance at Grand Slam tournaments. He has also shown a willingness to conserve energy when necessary and shorten points when conditions become difficult. At 39, he may no longer have the physical margin he possessed a decade ago, but his tactical intelligence remains extraordinary. Every match could become a calculation: when to attack, when to defend, when to shorten rallies and how much energy to spend.

The Early Rounds Could Be Crucial

One of the biggest keys to Djokovic's US Open title challenge could be the opening week. If he can avoid long five-set battles and control matches efficiently, he could preserve the energy needed for the second week. A favourable draw would also help reduce the physical burden. Reuters highlighted the importance of efficient service games, short early-round matches and energy conservation as Djokovic attempts to navigate the tournament. That may sound straightforward, but Grand Slam tennis rarely follows a script.

Djokovic's Mixed Doubles Exit Adds Another Concern

Djokovic also received an early taste of the US Open conditions in the revamped mixed doubles event, where he partnered Aryna Sabalenka. The star duo lost their opening match to Henry Patten and Katerina Siniakova in a deciding match tiebreak. Djokovic then attempted to play a practice match later in the day but stopped while trailing Zizou Bergs 3-0. Reports said there were no clear signs of a specific injury, but the decision inevitably added to questions about his physical readiness. It is important not to overstate the situation, however. Djokovic has often used limited tournament schedules and practice sessions as part of his Grand Slam preparation.

A Record Chase Against the Clock

There is another element that makes this tournament fascinating: Djokovic is competing against both his opponents and time. At 39, every Grand Slam appearance carries greater significance. The Serbian has already achieved virtually everything possible in tennis, but the pursuit of a 25th major continues to motivate him. His recent results suggest he remains capable of reaching the business end of the biggest tournaments. His physical struggles suggest that doing so may now require even greater discipline. That combination makes Djokovic one of the most compelling stories at US Open tennis 2026.

Djokovic Still Has Every Reason to Believe

Despite the concerns, Djokovic is not entering Flushing Meadows without confidence. His Grand Slam record in 2026 proves that he can still compete with the best. His experience at the US Open is unmatched, and the absence of Sinner gives him a more favourable landscape than he might have expected. The key question is simple: Can his body keep pace with his ambition? That could ultimately determine whether he lifts a fifth US Open trophy.

The Road to History Begins in New York

For Djokovic, this US Open represents another opportunity to add to an already extraordinary legacy. The Novak Djokovic US Open 2026 campaign comes with a unique combination of opportunity and uncertainty. The absence of Sinner has opened the draw, but Alcaraz and other contenders remain dangerous. Meanwhile, the heat and humidity could test the Serbian more than any opponent. Djokovic has spent his career finding solutions when circumstances turn against him. This time, the solution may involve managing his body as carefully as he manages his game. If he succeeds, the reward could be historic: a record-breaking 25th Grand Slam title and another chapter in one of tennis's greatest careers. If the conditions prove too demanding, however, his physical resilience could become the deciding factor long before the final. For Djokovic, the US Open is no longer just a battle against the world's best players. It is a test of whether experience, preparation and mental strength can overcome the limits of an ageing body.