After a dangerous weather delay had taken he and the afternoon field from the golf course at 4.05pm local time, play recommenced at 4.46 only to be called of for the final time at 8.10pm.
Early tomorrow morning, O'Hern will return to the 9th hole at Congressional, although the 18th hole of his second round, to attempt a six foot putt for birdie which will be the difference between him making or missing the cut. He was left stranded when play was abandoned for the day.
After his opening round of 77 on day one, O'Hern was behind the eight-ball as he headed into day two in the afternoon field. When he made the turn in one over par 36, his chances looked even more forlorn but birdies at the 5th and 6th had him within striking distance and he has given himself one further chance of making it through.
If he is to hole that putt then he will join John Senden and Marc Leishman (even par) and Jason Day at 1 over as Australians to make the cut.
Adam Scott bogeyed his final hole late in the day after finding the water to miss by an agonising one shot and Scott Hend, who had been the story of the opening day, also missed by one after a late three putt cost him what had been building as a fairytale story given the background to him getting a start in the tournament.