Denis Shapovalov got too excited and accidentally hit the umpire in the face with a tennis ball. Oops.
According to some comments on Reddit that we didn't fact check, Shapovalov was given a $7,000 fine and was disqualified from the match after this.
Let this be a lesson in controlling your emotions in professional scenarios. You can be sure that Mr. Shapovalov instantly regretted his rash action. The bad choice cost him the game, even though it was probably an honest mistake. He's still pretty young now - 17 - and happily still has time to learn from his experiences.