Jannik Sinner, the tennis world’s red-headed wunderkind, is having a season for the ages. He’s not just winning; he’s dominating, collecting Grand Slams like they’re Pokémon cards and making the other top players look like they’re playing with a frying pan. But as Sinner continues his march through the Vienna Open, a shadow looms over his seemingly unstoppable rise: the potential departure of his coach, Darren Cahill.

Let’s be real, Sinner has been on a tear. He’s snagged two Grand Slams, made the finals in the other two, and is generally making the ATP Tour his personal playground. Much of this meteoric success is credited to his super-coach duo, Simone Vagnozzi and, of course, the legendary Darren Cahill. Cahill, who joined the Sinner camp in 2022, is the guy who helped Agassi and Hewit

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