Jordan Spieth will be one of the chasers on Saturday, as the Texan put himself in contention for the Wanamaker Trophy and the career grand slam after a four under 66 to sit in a tie for second.
The three-time Major winner mixed six birdies with two bogeys and looks to have re-found his putting boots this week on the super-slick Bethpage greens.
Spieth’s will need to do something special tomorrow to keep up with Koepka, though, although it will always be hard to back against a man who has won 14 times including three Majors.
The 25-year-old hasn’t won anywhere since the 2017 Open at Royal Birkdale so a fourth Major victory, and career slam, this weekend would be a huge story.
His fellow multiple-Major champion Rory McIlroy is in for the weekend at three over after a one over 71.
McIlroy started badly with a double-single-double start to drop to seven over, but four birdies in his last six puts him within a shout over the next couple of days.
He won’t be winning his fifth Major this week, but a couple of good rounds will likely see him inside the top 10.
Adam Scott, on the other hand, is also in T2nd with Spieth after a brilliant day on the greens.
The 2013 Masters champion is back using the long putter and made 165ft of putts during the second round.
He shot a six under 64 despite a short missed putt on the 17th.
Tiger Woods was another battling with the cut line on Friday and eventually missed out by one.
Woods hit just three fairways in round 2. (Photo by Jamie Squire/Getty Images)
The Masters champion was wayward with his driver and shot 73 (+3) with six bogeys.
Rich Beem was one of the stories of the day, as the 2002 USPGA Champion and Sky Sports commentator birdied five of his last six holes to make the cut at four over.