The course this year at Shinnecock Hills has proven so unforgiving that not only Tiger Woods, but Jordan Spieth and Rory McIlroy, failed to make the cut for weekend play. Dustin Johnson, the world’s top-ranked golfer, led the field for the first half of the tournament – but, as always with pro golfers who take and maintain an early lead, the equally tricky part is to finish with the lead still intact. If that’s going to happen, it’ll be during today’s final round.