Madison Keys' Fiance Bjorn Fratangelo Is A NOSE PICKER

TMZ Sports- Madison Keys' fiancé found himself in a pick-le ... 'cause ESPN jumped to him at the wrong time -- and, they caught him fingertip deep in his nostril.

The American tennis star was in the third set of her round of 16 match against Italian player Jasmine Paolini Sunday when ESPN's broadcast flashed over to her coach and fiancé, Bjorn Fratangelo.

Check out the clip ... Bjorn's hanging out and chatting with a woman to his right, when he brings his fingers up to his nose and decides to drag out a bothersome boogie.

He's going at it for a while ... clearly trying to get a grip on whatever's irking him -- and, for some reason, ESPN decides to stay on the guy instead of cutting away.

Few things to unpack. First off, of course ESPN left the camera on the guy What do you expect them to do ? Some of the funniest moments in sports broadcasting are background characters or random moments. Like : 

Once they saw they had a golden moment they had to leave the camera on him. It sucks for the guy, but once they saw they had something they needed to keep the camera rolling. 

Second, it terms of most embarrassing things that can happen to someone on camera, I came up with a quick list that randomly popped in my head : 

- a shit stain on your pants 

- talking to someone your not supposed to 

- staring at someone your not supposed to 

- stains on your shirt 

- aggressively licking your fingers 

- biting your nails

You can make a case, picking your nose is right up there with all of them. 

Speaking of picking your nose, I feel like no one ever shakes it. You are a nose picker at a young age, and then become a nose picker for life. It's one of those habits that is a long life type thing, and clearly this guy is a nose picker. He can try to hide it, but times like this prove it's only amount of time until he gets exposed.