When it comes to being expressive, Jannik Sinner might not be the first player that comes to mind. The Italian World No. 1 is known for his aggressive, precise game, yet off the court, he’s often seen as hard to read. Alexander Bublik started that trend when he called Sinner “not human” back in 2021, and again dubbed him an “AI” after taking a triple breadstick loss at the 2025 US Open. But there’s more to the four-time Grand Slam champion than meets the eye. And while he stands at the top of the sport, even he knows he’s not perfect.

Posted by Tennis Channel, the World No. 2 was asked what his fans might say about his game, or what his tennis red flag would be. His reply was honest, if a little uncertain. “My red flag is…I don’t know, because you cannot see what I feel inside someti

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