Jannik Sinner's Serve Evolves into a Dominant Asset

The effectiveness of Sinner’s serve is rooted in his technique. He initiates with a pinpoint stance, sliding his back foot forward as he tosses the ball. This movement allows him to generate maximum energy through his kinetic chain, culminating in a powerful strike inside the court. Sinner's rhythm is also crucial; he begins his motion slowly and accelerates at contact, leading to exceptional accuracy. While Zverev averaged serving aces at 133 mph in their Wimbledon final, Sinner's serves, which were slightly slower, showcased his strategic effectiveness. Nick Kyrgios, once critical, now considers Sinner “one of the best pinpoint servers we have.”

Using an Eastern backhand grip, Sinner maintains a neutral racket head position, enabling him to create both pace and spin. His toss is consistent, releasing the ball to a uniform height and distance, allowing for precise contact at the peak of its arc, which results in repeated success in his serve.

Sinner’s serving prowess is the result of dedicated coaching. Four years ago, Simone Vagnozzi took over from Riccardo Piatti, prioritizing Sinner’s serve. Vagnozzi aimed to eliminate a hitch in his motion and position the toss more aggressively. Reflecting on this journey in May, Vagnozzi expressed pride in Sinner's swift progress and mental strength.

Transitioning from a platform stance, Vagnozzi and his team revamped Sinner's technique by adopting a classical off-side lift and a pinpoint stance. This adjustment saw Sinner’s ace rate rise significantly, from 8.9% in 2025 to 16.4% in 2026.

After losing the 2025 US Open final to Carlos Alcaraz, Sinner re-evaluated his already elite serve. Vagnozzi noted the need for changes in motion and rhythm, and Sinner made quick adjustments during a trip to China. His new toss was repositioned from slightly forward to directly over his head, creating a smoother flow.

Fellow players have commended Sinner's serving improvements. On The Player's Box podcast, Jessica Pegula and Madison Keys highlighted his wide ad-side serve as particularly effective, and Sinner has reportedly modeled aspects of his serve after John Isner.

Under pressure, Sinner’s serve excels. In early 2025, analyst Jeff Sackmann noted that Sinner won 71.5% of his service points, which increased to 72.5% during break points. His average first serve speed also demonstrated an increase during critical moments, reaching 121 mph at a 15-30 score compared to 113 mph at 40-0.

Throughout the 2023 Wimbledon tournament, Sinner showcased his serve’s reliability, saving the only break point faced against both Djokovic and Zverev, and finishing with 128 aces in the men's draw. In the final, he delivered 15 aces and won 80% of first-serve points.

So far in 2026, Sinner achieved a first-serve percentage of 67.5%, an improvement from 61.9% in 2025, along with an impressive 11.1 aces per match and a 94% service hold rate. His average first-serve speed has increased from 117 mph in 2022 to 123 mph in 2025.

Currently, Sinner's competition is on pause due to a right knee injury that forced him to withdraw from the US Open and skip the China Open. His participation in upcoming tournaments remains uncertain.