強風使得希尼庫克丘球場更形棘手，選手們無不怨聲載道。前兩輪以69-67一路領先的世界球王達斯丁‧強森(Dustin Johnson)第三輪馬前失蹄，打出高於標準桿7桿的77桿，不過三輪213桿(+3)仍足以和衛冕者布魯克斯‧柯普卡(Brooks Koepka)以及東尼‧費納(Tony Finau)和丹尼爾‧伯格(Daniel Berger)並列領先。
費納和伯格力爭上游，共同打出當日最低桿的66桿，躍居並列領先。賈斯丁‧羅斯(Justin Rose)落後一桿暫時位居第五。亨利克‧史坦森(Henrik Stenson)緊追在後，以215桿單獨位居第六。派翠克‧瑞德(Patrick Reed 和2003年美國公開賽冠吉姆‧佛瑞克(Jim Furyk)落後領先者三桿，暫時並列第七。
第四輪分組表(美東時間)
8:21 a.m. -- Andrew Johnston
8:32 a.m. -- Byeong Hun An, Patrick Rodgers
8:43 a.m. -- Phil Mickelson, Rickie Fowler
8:54 a.m. -- Ross Fisher, Tim Wilkinson
9:05 a.m. -- Tyler Duncan, Calum Hill
9:16 a.m. -- Kevin Chappell, Mickey DeMorat
9:27 a.m. -- Jimmy Walker, Hideki Matsuyama
9:38 a.m. -- Cameron Wilson, Jason Dufner
9:49 a.m. -- Will Grimmer (a), Aaron Baddeley
10:00 a.m. -- Dean Burmester, Brian Harman
10:11 a.m. -- Patrick Cantlay, Sam Burns
10:22 a.m. -- Peter Uihlein, Luis Gagne (a)
10:33 a.m. -- Matthieu Pavon, Bill Haas
10:44 a.m. -- Marc Leishman, Alex Noren
10:55 a.m. -- Pat Perez, Louis Oosthuizen
11:06 a.m. -- Chris Naegel, Haotong Li
11:17 a.m. -- Matt Parziale (a), Steve Stricker
11:28 a.m. -- Brandt Snedeker, Jhonattan Vegas
11:39 a.m. -- Charles Howell, Rafa Cabrera Bello
11:50 a.m. -- Brendan Steele, Scott Piercy
12:01 p.m. -- Tommy Fleetwood, Russell Henley
12:12 p.m. -- Russell Knox, Ryan Fox
12:23 p.m. -- Paul Casey, Francesco Molinari
12:34 p.m. -- Matthew Fitzpatrick, Justin Thomas
12:45 p.m. -- Bryson DeChambeau, Xander Schauffele
12:56 p.m. -- Zach Johnson, Webb Simpson
1:07 p.m. -- Gary Woodland, Charley Hoffman
1:18 p.m. -- Ian Poulter, Branden Grace
1:29 p.m. -- Tyrrell Hatton, Dylan Meyer
1:40 p.m. -- Brian Gay, Jim Furyk
1:51 p.m. -- Patrick Reed, Kiradech Aphibarnrat
2:02 p.m. -- Henrik Stenson, Justin Rose
2:13 p.m. -- Dustin Johnson, Brooks Koepka
2:24 p.m. -- Tony Finau, Daniel Berger
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