Shane Lowry remains best of the Irish contenders after the second round at the FedEx St Jude Championship in Memphis.
A repeat of Thursday's opening 68 saw the Offaly man move up to four-under in the first of the FedEx Cup play-off events, three shots clear of Rory McIlroy, who posted a 69 on the TPC Southwind course but missed the cut after a final-hole bogey.
It was a day to forget for Seamus Power, who finished on four-over after a 73.
J.J. Spaun shot a three-under 67 on Friday and holds a one-stroke lead.
Lowry, 28th in the FedEx Cup standings after last week's Wyndham Championship, had a mixed front nine, with a birdie on three before consecutive bogeys on six and seven.
He bounced back immediately when he birdied eight. After a bogey on 10, Lowry finished strongly with four birdies in the next six holes before bogeying 18.
Two-time FedEx Cup champion McIlroy, sixth in the points list, missed out despite a strong start to the second round which saw him birdie the first two holes.
A pair of bogeys by the turn stalled that momentum before he rallied with birdies on 11 and 15.
McIlroy, playing his first event since finishing third at the 150th Open Championship last month, was three under with four holes to play.
But the Northern Irishman, who started on the back nine, dropped shots at the sixth and ninth – his last when he missed the green and could not get down in two – to card a 69 and miss the weekend action by one.
World number one Scottie Scheffler also missed the cut by a shot.
Power, 24th in the FedEx Cup standings, struggled on day two with the Waterford man bogeying four of the first five holes. Birdies on six, eight and 12 marked an improvement but bogeys on 15 and - like the other members of the Irish trio - on 18 saw him post a three-over round.
Spaun is one shot ahead of Troy Merritt and Austria's Sepp Straka after two trips around TPC Southwind. Straka shot a 66 and Merritt carded his second straight 65. Denny McCarthy is alone in fourth and two shots back after a 65.
Open champion Cameron Smith fired a second-round 65 to move into a share of fifth place, three back from Spaun.
Spaun shot a stellar 62 in the first round to share the lead with Si Woo Kimof South Korea. While Kim faltered with a three-over 73 to slip into a tie for 27th, Spaun put together another solid round.
Spaun, 31, made five birdies and two bogeys while posting the top 36-holes core of his career.