Scottie Scheffler lost his cool out on the golf course on Friday -- throwing an F-bomb-laced temper tantrum that was so loud and animated, it was captured on live TV.
It all went down minutes ago out at the PGA Tour's BMW Championship in Denver, Colo. ... when the world's No. 1-ranked golfer made a mess of Castle Pines' hole No. 10.
On the 553-yard Par 4, Scheffler hit his second shot right into the water ... and when he then bungled his next swing, he couldn't hide his frustration.