Jason Day’s participation at US Open in doubt after collapsing at 9th hole

• Day collapses from vertigo-like symptoms at end of his second round
• Australian eventually cards a round of 70Unfortunately one of the abiding images of the 115th US Open will not involve holed putts or a trophy presentation. Jason Day’s sudden collapse on the 9th fairway at Chambers Bay as he edged towards completion of round two cast a long shadow over an otherwise invigorating day of US Open golf. At one end of the event Jordan Spieth endorsed his willingness to win back-to-back majo