An MLB fan flipped over some railing and crash-landed onto his head trying to track down a Home Run Derby ball Monday ... but somehow, the dude escaped with no serious injuries.
The wild spill happened early in the MLB's long-ball event at Coor's Field in Denver ... when A's star Matt Olson cranked a dinger deep into the stadium's right field upper deck.
The man could be seen on the broadcast reaching over some railing to try to catch the ball ... but when he stretched just a little too far, he tumbled to the concrete below.