Jannik Sinner is defending his title at Wimbledon, and his skiing background is giving him an edge.
He was one of Italy's top junior skiers before turning to tennis full time.
What is Sinner's secret?
Sinner's ability to stay in balance is impressive, according to Lindsey Vonn.
She says he has an amazing kinesthetic sense, which helps him move fluidly on the court.
How does skiing help Sinner's tennis?
Sinner's experience as a skier has taught him how to shift his weight and move quickly.
This skill is transferable to the tennis court, where he can rush back and forth across the baseline with ease.
What do other players think of Sinner's movement?
Casper Ruud agrees that Sinner's movement is one of his strongest assets.
Ruud says Sinner is strong in balance and flexible, allowing him to get into position quickly.
Sinner won a national skiing championship at the age of eight and placed second in Italian nationals at 12.
He decided to focus on tennis instead of skiing due to the dangers and physical demands of the sport.
Lindsey Vonn, who shares a common sponsor with Sinner, has skied with him and says he is fluid and smooth on the slopes.
She enjoys skiing with him and hopes to do it again after his tennis career.
Many elite skiers, including Vonn and Bode Miller, play tennis as a form of cross-training.
It helps improve their footwork, mental strength, and general athleticism.
Vonn was the top World Cup downhiller last season at the age of 41.
She suffered a horrific crash at the Milan Cortina Olympics in February, leaving her with a severely fractured left leg.
Sinner's skiing background is just one aspect of his impressive tennis game.
He is currently ranked as one of the top players in the world and is a strong contender to win the Wimbledon title.