This shot should genuinely be illegal.
Roger Federer advanced to the next round of the US Open after beating Nick Kyrgios in straight sets (6-4, 6-1, 7-5), which included a winner people are calling the shot of the year.
The No.2 seed was leading two-sets when he produced a truly outrageous winner.
Federer returned Kyrgios' thunderous serve who then pulled off a nice little shot himself, with the Swiss legend sprinting towards the ball.
He got to the ball and hit it around the net post in stunning fashion.
Kyrgios' reaction says it all.
Speaking after the game, Federer enjoyed his handy work saying it was one of the greatest shots in his illustrious career.
"I definitely think it was a special one, no doubt about it," he said.
"You don't get an opportunity to hit around the net post very often. You can't train for that.
"The net is out further and the court is more narrow, so for a shot like this to happen in a practice, you will be running into a fence and you will hit it into the net.
"These shots can only really happen on a big court."
The maverick Australian was in awe of his counterpart.
"It was almost unreal," he said.
"Almost got to the point where I wanted him to start making shots like that, and I finally got it.
"If anyone else is doing those shots against me, I'm probably not too happy. But it's Roger."
Federer hasn't won the US Open since 2008. He's won the prestigious hard court tournament an impressive five times, though.
Will 2018 be his year?