It’s a pretty damn good Photoshop job for a meme that’s for sure. The advantage to doing it with something in sports setting is the space is usually incredibly well lit, so if you have a very well lit subject, it can blend in more easily. You don’t have contrasty areas or shadows to contend with that even someone who isn’t looking for evidence will pick up on.

Good combination of shop skills and choosing their images. That being said, there are some giveaways if you really look.