Sinner wears a strange device during practice ahead of Wimbledon 2026

Jannik Sinner is focused on overcoming the fitness problems he faced at Roland Garros in order to compete at the upcoming grass-court Grand Slam later this month.

Jannik Sinner is drawing the attention of tennis fans as he appeared on the practice court with a white device attached to his left arm. This image quickly sparked speculation about the health condition of the world No.1 player during his preparation for Wimbledon 2026.

According to Italian media, the device Sinner uses is a blood glucose monitor, which has been incorporated into a comprehensive physical assessment program following signs of unusual stamina decline at Roland Garros. This is not a treatment tool for any disease but rather a data-collection device to analyze the body's metabolic responses during high-intensity training and competition.

Sinner's medical team conducted a series of tests at San Raffaele Hospital after the Italian player experienced an inexplicable slump in Paris. In his match against Juan Manuel Cerundolo, Sinner had a huge advantage before suddenly losing control completely and dropping 18 consecutive games. This incident was seen as an abnormal physical sign rather than a technical or tactical issue.

Initial test results have ruled out the risk of underlying diseases. Therefore, the current focus is on understanding the cause of energy depletion during long matches. Real-time blood glucose monitoring will help the professional team assess the relationship between energy levels, recovery ability, and Sinner's performance during the most stressful moments.

In addition, experts are also conducting cardiovascular analyses, blood tests, and studies on factors related to nutrition, energy supplementation, as well as pre- and post-match recovery procedures.

Currently, the world No.1 continues to train in Monte Carlo before heading to London for exhibition matches at Hurlingham Club. This will be his only appearance on grass before stepping into Wimbledon, where the 25-year-old carries the responsibility of defending the title he won last season.

Amid the situation where Carlos Alcaraz is not participating in this year's tournament, Sinner is regarded as the top candidate for the championship.