Carlos Alcaraz quickly congratulated his rival Jannik Sinner on Sunday after the Italian defeated Taylor Fritz 6-3, 6-4, 7-5 for the US Open title.

“🏆You deserve it!🤝🏻” Alcaraz wrote on X, formerly known as Twitter. “Enjoy the moment.”

Alcaraz and Sinner’s Lexus ATP Head2Head rivalry has become a must-watch spectacle. The two superstars, aged 21 and 23, respectively, split the four Grand Slam tournament titles this season.

Alcaraz suffered a shock second-round defeat at the US Open to Botic van de Zandschulp, but followed along and shared his message for the Italian within minutes of the match ending.

ATPTour.com looks at social media reaction to Sinner's victory.

[ATP APP]

Congratulations @janniksin! 🏆 You deserve it! 🤝🏻 Enjoy the moment! https://t.co/uDUNKhQwRr

— Carlos Alcaraz (@carlosalcaraz) September 8, 2024

What a year for @janniksin!

Congratulations to him on his first #USOpen win! https://t.co/nPAUUm4Rcu

— Billie Jean King (@BillieJeanKing) September 8, 2024

Amazing tennis today!
Congrats @janniksin 🏆🙌#USOpen2024 @usopen pic.twitter.com/cCtV40TCtz

— Gabriela Sabatini (@sabatinigabyok) September 8, 2024

Amazing tournament Taylor! Congrats on grand slam #2 @janniksin!!

— lindsey vonn (@lindseyvonn) September 8, 2024

Congrats 🍾 to Sin City @janniksin on the daily double winning @AustralianOpen @usopen the 1st player too win his 1st 2 slams in season since Willie Vilas in 1977

— Brad Gilbert (@bgtennisnation) September 8, 2024

Congratulations on another Major achievement 🇺🇸🏆 You’re the best, @janniksin! https://t.co/uoa9krMrjc

— AC Milan (@acmilan) September 8, 2024

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