US Open descends into farce as Dustin Johnson and Shane Lowry contend for first major

Players and spectators have been left unsure of what Johnson's score is with just six holes to play.

The US Open descended into farce on Sunday after an incident involving Dustin Johnson left players, officials and spectators unsure of what his score was with just six holes to play.

Johnson began the final round at Oakmont four shots behind Ireland's Shane Lowry, but found himself two in front thanks to birdies on the second and ninth and four bogeys in the first 10 holes from Lowry.