With more than three hours still remaining before the final group of Jim Furyk and Graeme McDowell take to the golf course, the combination of more demanding pins, stronger breezes and less overnight watering may well see the Olympic Club layout playing at its most difficult all week.
The expected winds of yesterday afternoon never really arrived and the golf course played the easiest it had all week. It appears very unlikely therefore that the 13 under par rounds of yesterday will be neared which means for those four and five behind the lead they have a real task on their hands.
So too, mind you, do the leaders who will have no easy task in just holding their scores together with the title well and truly on the line.
The storylines are many with experienced veterans, former US Open winners, perhaps the game's greatest without a major, Lee Westwood, other first time major hopefuls and a youngster of just 17 years of age all battling it out for their shot at glory.
Throw into that mix the Australian John Senden, who in three previous starts at the US Open had a best of 30th at Congressional last year but who yesterday forced his way into contention with a round of 68 to get within four of the lead.
Senden's rock solid tee to green game has him on the fringe of his best ever major championship finish. That came when 4th at the 2007 PGA Championship, but if he is able to put together a good day on the greens today then who knows what lies in store.
In 16 other major championships however Senden's next best was that 30th place last year so today promises one of his better days in the major championship career of the Queenslander.
Just how good it is remains to be seen but yesterday' effort might be the catalyst for more.