Daniil Medvedev just can't help himself.
The Russian tennis star was caught on camera mouthing the word "boring" under his breath during the Australian Open trophy presentation.
More specifically, he appeared to say it during Tennis Australia chair Jayne Hrdlicka's speech.
Despite leading two sets to love during the final to Rafael Nadal, Medvedev completely capitulated and ended up losing the match.
It handed Nadal his record-breaking 21st Grand Slam title, making him the most successful men's tennis player of all-time.
There were a few moments throughout the clash where Medvedev lost his cool, but overall he appeared to take the loss relatively well.
Well, sort of.
"Daniil, you have had the most extraordinary tournament. You have found yourself in tough spots on the way here," Hrdlicka said during the post-match ceremony.
"You have demonstrated you're never finished and you were never finished until the very last point. Congratulations on a great tournament."
It was then that the world No.2 proceeded to roll his eyes and mutter the word "boring" while Hrdlicka congratulated him.
His face may not have been up on the big screen inside Rod Laver Arena at the time, but Medvedev's act was caught on camera and shared on social media.
Hrdlicka continued: "You were clearly determined to boot history in the making for the second time in a row and that didn't happen tonight, but there is no doubt that we are going the see you back here and that you are on your way to making your own records in the tennis history books. Congratulations."
There were other times dotted throughout the ceremony where he could be seen shaking his head too.
Medvedev did, however, give a somewhat classy speech himself where he heaped praise on Nadal.
"(The match) was insane. I think the level was very high," Medvedev said.
"You (Nadal) raised your level after two sets (to win) a 21st grand slam.
"I thought he was going to get tired and maybe he did just a little, but still won the match."
Featured Image Credit: Twitter/EurosportTopics: Jayne Hrdlicka, Daniil Medvedev, Tennis, Video, Australian Open, watch, Australia, Jayne Hrdlicka, Daniil Medvedev, Tennis, Video, Australian Open, watch, Australia