Wimbledon champion Jannik Sinner has rehired Umberto Ferrara as his fitness coach nearly a year after firing him for his role in the top-ranked player’s doping case.

Sinner tested positive twice for an anabolic steroid during the 2024 Indian Wells Tournament. He tested positive for a substance called Clostebol, which is notably banned in tennis, and he was first popped for the steroid during Indian Wells, and then again eight days later in an out-of-competition sample.

Nick Kyrgios has led a wave of outrage as Jannik Sinner announced controversial high-performance coach Umberto Ferrara has returned to his team.

JANNIK SINNER has rehired the fitness coach that played a key role in his failed drugs tests last year. Prior to winning Wimbledon this summer, Sinner, 23, served a three-month ban after twice

Jannik Sinner's coach, Simone Vagnozzi, talked with ATP Tour after his protégé secured the Wimbledon title. A couple of weeks ago, Sinner achieved the fourth Grand Slam title of his career – and his first outside of hardcourts – by defeating his frequent rival Carlos Alcaraz 4-6,

In a long interview with the official ATP website, his main coach Simone Vagnozzi spoke about Sinner's rise: "Jannik is a very calm and mature person in relation to his age, he knows exactly what he wants to achieve and always gives his best to achieve his goals. His secret is precisely the constant desire to improve without ever being satisfied."