The 21 & Under Club in '21: Holger Rune

Will turn 22 on

• 4/29/2025

What he’s done since last summer

• Won his first ATP Challenger title (Biella)
• Reached his first ATP quarterfinal in Chile
• Made his Masters 1000 main draw debut in Monte Carlo

Key Stat

• Rune racked up a 25-9 post-lockdown record from August 2020 through the end of the season.

Long led by former world No. 1 Caroline Wozniacki, Danish tennis can boast teen talents on both ATP and WTA tours, the former a 17-year-old with a training base at the Patrick Mourataglou Academy.

“She was an unbelievable fighter on the court and I think we could learn a lot from her,” Rune told ATPTour.com of Wozniacki earlier this year.

Rune’s competitive instincts have been on display since topping the junior rankings and winning the boy’s singles title at Roland Garros. That same year, he served as a practice partner for the game’s best at the ATP Finals.

“To be able to play with Roger, Novak…was a dream come true because you always watch them on TV and you see how they are during tournaments and everything and also see that they’re humans, too.”

On a tear through the ITF circuit since last fall—winning four titles from seven finals—the teen made his ATP debut in South America this spring. As a wildcard in Chile, he qualified for the main draw and thumped Benoit Paire en route to the quarterfinals.

“I love tennis and I love traveling for tournaments,” Rune said. “I like to play aggressive, I like to play on clay, hard court. I don’t mind any surface.”

His breakthrough win in Biella was tainted by controversy as he was overheard uttering homophobic slurs during his semifinal; Rune has since apologized and was fined for the audible obscenities.