Jason Day was on his way to a fourth win this year and eighth win in 20 starts total when he was leading at Firestone Country Club with four holes to play, only to fail dramatically.

His stumbles allowed a new US Open champion Dustin Johnson to claim his second win in just as many starts, propelling the American to victory.

Jason Day has vowed to use his dramatic late collapse at the World Golf Championships Bridgestone Invitational as motivation for the British Open.

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