Seamus Power's PGA Tour season has been extended by at least two days but only just about.

Having secured his PGA card in front of his television last weekend, the Waterford golfer was one of 14 golfers - alongside Tiger Woods - who made the cut at the Northern Trust by a single shot.

Power shot an even par 71 to stand on even par for the weekend, requiring a birdie four on the 17th to maintain his interest in this year's lucrative FedEx play-offs.

Ian Poulter and Paul Casey saw their hopes of qualifying automatically for next month's Ryder Cup dealt a blow during the second round as Brooks Koepka moved into a share of the lead.

US Open and US PGA Championship winner Koepka joined fellow American Jamie Lovemark at the top of the leaderboard on 10 under with a six-under-par 65 in New Jersey.

The top 100 in the FedEx rankings at the end of the weekend will progress to next week's Dell Technologies Championship.

Automatic qualification for Thomas Bjorn's side ends next week, and with Thorbjorn Olesen - the current occupant of the eighth and final spot on the European team - taking a week off, 10th-placed Poulter and 11th-placed Casey have a chance to put themselves in pole position for a place at Le Golf National.

Casey moved to within two shots of the lead with three birdies on the front nine, but had four bogeys and a double-bogey on his back nine, with a 73 leaving him eight shots off the pace in a share of 44th.

Fellow Englishman Poulter also had a tough finish, tangling with a bunker at the eighth - his last - and running up a double bogey six to make the cut on the mark at level par alongside Woods, who was round in 71.

Koepka and Lovemark, who carded a 66, are a shot ahead of Adam Scott.

The Australian enjoyed the day's best round with a 64 that took him to nine-under and into third overall.

He is followed by America's Dustin Johnson, who had another round of 67 to sit two shots back, despite making two triple bogeys this week.