Golf star Tyrrell Hatton melted down on the course at The Open on Friday ... snapping his club in half in a wild temper tantrum that was all caught on broadcast cameras.
The 29-year-old -- who's currently the #10-ranked golfer in the world -- completely lost his cool on the 18th hole at Royal St. George's Golf Course at the end of his second round.
Hatton hit his approach shot into the green about a dozen yards off target ... and after the poor shot -- he took his anger out on his iron.