It could be a huge evening for Offaly's Shane Lowry who is just three shots off the lead at the US Open from Chambers Bay. Follow his progress here.
As the US Open surged to a thrilling climax on this day two years ago, Kevin Phelan sat with the game's elite in the players' lounge at Merion, pleased to have gone where no Irish amateur had gone before. There, he marvelled at television images of a winning par from Justin Rose on the 511-yard 18th, which he himself had been satisfied to bogey some hours earlier.
It has taken a remarkably insightful 21-year-old to put a professional perspective on the quirky challenge of Chambers Bay. "If you are going to talk negative about a place," said Jordan Spieth, "you're almost throwing yourself out to begin with because golf is a mental game."