PGA Tour stud Paul Casey nearly had one less trophy on his mantle this week ... and it's all 'cause he struck a bug with his golf ball on a routine putt!!
Here's the deal ... Casey was playing in the European Tour's Porsche European Open in Germany this past weekend -- when he lined up for a short putt on one of the holes.
Casey pulled back his club, struck the golf ball ... and he sank the shot no problem!
BUT ... turns out, there was a small issue -- video replay showed Casey's ball had struck a tiny bug on its way to the hole.