Housemates Zach Johnson and Kevin Kisner set the pace as Tommy Fleetwood and Rory McIlroy headed the European bid to end American dominance of golf's majors.
Johnson, who is looking to become the first player in history to win major titles at Augusta, St Andrews and Carnoustie, added a 67 to his opening 69 to set the clubhouse target on six under par.
First-round leader Kisner looked set to surpass that with ease when he birdied the 13th and 14th to reach eight under, only to hit his second shot to the 18th into the Barry Burn and run up a double-bogey six.
That meant Fleetwood was just a shot off the lead after earlier defying miserable conditions to card the only bogey-free round of the day, his flawless 65 just two shots outside the course record he set in last year's Dunhill Links Championship.
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|0915||Gavin Green (Mal)|
|0925||Rhys Enoch, Patrick Reed (USA)|
|0935||Kiradech Aphibarnrat (Tha), Justin Rose|
|0945||Yusaku Miyazato (Jpn), Tyrrell Hatton|
|0955||Ross Fisher, Keegan Bradley (USA)|
|1005||Ryan Fox (Nzl), Jason Dufner (USA)|
|1015||Bryson DeChambeau (USA), Henrik Stenson (Swe)|
|1025||Tom Lewis, Sam Locke (a)|
|1035||Paul Casey, Chris Wood|
|1045||Bernhard Langer (Ger), Rafael Cabrera-Bello (Spa)|
|1100||Paul Dunne, Brett Rumford (Aus)|
|1110||Masahiro Kawamura (Jpn), Shubhankar Sharma (Ind)|
|1120||Cameron Smith (Aus), Brendan Steele (USA)|
|1130||Marc Leishman (Aus), Lee Westwood|
|1140||Byeong-Hun An (Kor), Kevin Na (USA)|
|1150||Julian Suri (USA), Adam Hadwin (Can)|
|1200||Gary Woodland (USA), Si Woo Kim (Kor)|
|1210||Yuta Ikeda (Jpn), Satoshi Kodaira (Jpn)|
|1220||Marcus Kinhult (Swe), Thomas Pieters (Bel)|
|1230||Beau Hossler (USA), Haotong Li (Chn)|
|1245||Cameron Davis (Aus), Sean Crocker (USA)|
|1255||Louis Oosthuizen (Rsa), Stewart Cink (USA)|
|1305||Phil Mickelson (USA), Austin Cook (USA)|
|1315||Shaun Norris (Rsa), Tiger Woods (USA)|
|1325||Lucas Herbert (Aus), Michael Kim (USA)|
|1335||Jason Day (Aus), Francesco Molinari (Ita)|
|1345||Sung Kang (Kor), Webb Simpson (USA)|
|1355||Patrick Cantlay (USA), Eddie Pepperell|
|1405||Matthew Southgate, Brooks Koepka (USA)|
|1415||Kyle Stanley (USA), Adam Scott (Aus)|
|1430||Charley Hoffman (USA), Alex Noren (Swe)|
|1440||Ryan Moore (USA), Brandon Stone (Rsa)|
|1450||Luke List (USA), Danny Willett|
|1500||Thorbjorn Olesen (Den), Rickie Fowler (USA)|
|1510||Jordan Spieth (USA), Kevin Chappell (USA)|
|1520||Zander Lombard (Rsa), Tony Finau (USA)|
|1530||Matt Kuchar (USA), Erik Van Rooyen (Rsa)|
|1540||Rory McIlroy, Xander Schauffele (USA)|
|1550||Pat Perez (USA), Tommy Fleetwood|
|1600||Kevin Kisner (USA), Zach Johnson (USA)|
All times BST.