Christmas in ... January? Sharapova shares hilarious holiday blooper reel to celebrate Australian Open champ Sinner

Jannik Sinner might be the newest Australian Open champion, but he won't be Italy's next "Eurovision" contestant—and we learned that Sunday thanks to former world No. 1 Maria Sharapova.

Sharapova literally joined the chorus of those who congratulated Sinner on his five-set victory over Daniil Medvedev in Sunday's men's final by sharing a hilarious clip of her and Sinner singing holiday karaoke on social media. In the undated blooper reel, Sharapova and Sinner are wore a pair of matching reindeer antlers while they crooned a verse from the famous Christmas earworm, "Rockin' Around the Christmas Tree."

"I knew that one day you'll regret this," Sharapova wrote to acompany the video. "Congrats champ! Patience, poise and class."

Five-time Grand Slam champion Sharapova and Sinner first linked up as a result of their collaboration with Italian tennis coach Riccardo Piatti, who coached Sinner from age 13 up until early 2022. Piatti was also the last coach Sharapova had in her career, from 2019 to her 2020 retirement.

Speaking on player-turned-broadcaster Rennae Stubbs' podcast last year, Sharapova dubbed Sinner one of her favorite young talents.

"I’m always rooting for him. I just like his humble approach to the sport,” Sharapova told Stubbs. “I love seeing the younger generation. There’s an aura about the men’s game, it’s very evident. They have different styles of play, different personalities, from different parts of the world, and it’s just fun to see these rivalries come together. I think the men’s game is in a good state.”

The praise was mutual: Sinner dubbed Sharapova "one of the greatest champions" when asked by Tennis Channel in 2022 who his dream mixed doubles partner would be, but also lauded her character and professionalism to Spanish publication Marcain 2021.

“I feel lucky to have met her personally. She really impressed me with her professionalism. Her tennis was incredible, which is evident in what she achieved,” the Italian said. “She had a different and special type of mentality that few players have."

But Sharapova wasn't the only player to wish Sinner well in the aftermath of his maiden Grand Slam victory, even if hers was easily the most creative. Carlos Alcaraz, Victoria Azarenka, Petra Kvitova and Iga Swiatek were among the current crop of tennis stars who quickly logged to congratulate the Italian's thrilling Melbourne milestone