SOUTHPORT, ENGLAND - JULY 20: Jordan Spieth of the United States in action during the first round of the 146th Open Championship at Royal Birkdale on July 20, 2017 in Southport, England. (Photo by Stuart Franklin/Getty Images)

American star Jordan Spieth has a three-way share of the lead after the first round of the British Open.

Spieth, along with Brooks Koepka and Matt Kucher, is tied at five-under par, after shooting a round of 65 on day one.

Australian Jason Day, who had social media buzzing with some rather strange high top Nike golf shoes, is four shots back at one-under, as are fellow Aussies Adam Scott, Marc Leishman, Aaron Baddeley and Andrew Dodt.

Day had an up and down round, but rallied with late birdies to stay in contention.

“It was kind of back and forth,” Day said.

“It’s really hard because for the most part I hit most irons going up to 15 and then you pull driver out and it feels foreign.

“I hit three poor drives, going up 15, 16, 17. Got myself out of position on all those holes, and didn’t play well.

“Those are the holes where you can kind of get some back and unfortunately didn’t get them back.

“But I made a good putt on 18, which was a nice way to finish.”

Day's footwear was one of the major talking points of the day, with his shoes even likened to Marty McFLy's futuristic Nike shoes in Back to the Future Part Two.

Full Day One leader board:

65 — Brooks Koepka (USA), Matt Kuchar (USA), Jordan Spieth (USA)

66 — Paul Casey, Charl Schwartzel (RSA)

67 — Richard Bland, Charley Hoffman (USA), Justin Thomas (USA), Ian Poulter, Austin Connelly (CAN), Rafael Cabrera-Bello (ESP)

68 — Richie Ramsay, Hideki Matsuyama (JPN), Alex Noren (SWE), Joost Luiten (NED), Stuart Manley, Kang Sung-Hoon (KOR), Ernie Els (RSA), David Lipsky (USA), James Hahn (USA), Martin Laird, Daniel Berger (USA), Bubba Watson (USA), Kevin Na (USA), Kent Bulle (USA)

69 — Jason Day (AUS), Andrew Johnston, Adam Scott (AUS), Robert Streb (USA), Aaron Baddeley (AUS), Bernd Wiesberger (AUT), Matthew Fitzpatrick, Thomas Pieters (BEL), Henrik Stenson (SWE), Jon Rahm (ESP), Marc Leishman (AUS), Xander Schauffele (USA), Andrew Dodt (AUS), Li Haotong (CHN)

70 — Steve Stricker (USA), Ross Fisher, Toby Tree, Gary Woodland (USA), Branden Grace (RSA), Brian Harman (USA), Kim Si-Woo (KOR), Thongchai Jaidee (THA), Tony Finau (USA), Andy Sullivan, Thorbjorn Olesen (DEN), Russell Henley (USA), Kevin Kisner (USA), Matthew Griffin (AUS), Paul Lawrie, Yusaku Miyazato (JPN), Kyle Stanley (USA), Laurie Canter

71 — Soren Kjeldsen (DEN), Shaun Norris (RSA), Adam Hadwin (CAN), Danny Willett, Jamie Lovemark (USA), Webb Simpson (USA), Bill Haas (USA), Justin Rose, Rickie Fowler (USA), a-Alfie Plant, Chris Wood, Darren Fichardt (RSA), J.B. Holmes (USA), Chang Yi-Keun (KOR), Song Young-Han (KOR), Alexander Levy (FRA), Yuta Ikeda (JPN), Rory McIlroy, Dustin Johnson (USA), Lee Westwood, Scott Hend (AUS)

72 — Joseph Dean, Martin Kaymer (GER), Tom Lehman (USA), Matthew Southgate, Peter Uihlein (USA), Chan Kim (USA), David Drysdale, Sean O’Hair (USA), Shane Lowry, Jimmy Walker (USA), Pablo Larrazabal (ESP) 73 — Shiv Kapur (IND), K.T. Kim (KOR), Jason Dufner (USA), Brandon Stone (RSA), Michael Hendry (NZL), Sergio Garcia (ESP), a-Connor Syme, Dylan Frittelli (RSA), Anirban Lahiri (IND), Padraig Harrington, Kevin Chappell (USA), Patrick Reed (USA), Phil Mickelson (USA), Francesco Molinari (ITA), Kim Gi-Whan (KOR), Haydn McCullen

74 — Pat Perez (USA), Matthieu Pavon (FRA), Ryan Fox (NZL), Callum Shinkwin, Charles Howell III (USA), John Daly (USA), Phachara Khongwatmai (THA), Cameron Smith (AUS), Julian Suri (USA), Wesley Bryan (USA), Russell Knox, Ryan Moore (USA), Paul Waring, Nick McCarthy, Sebastian Munoz (COL)

75 — Mike Lorenzo-Vera (FRA), Zach Johnson (USA), Alexander Bjork (SWE), David Horsey, Darren Clarke, a-Luca Cianchetti (ITA), Paul Broadhurst, Adam Bland (AUS), Tyrrell Hatton, Jhonattan Vegas (VEN), Mark Foster, Ashley Hall (AUS) 76 — Brendan Steele (USA), Emiliano Grillo (ARG), Tommy Fleetwood, Prayad Marksaeng (THA), Bryson DeChambeau (USA), Roberto Castro (USA), Billy Horschel (USA), Jbe Kruger (RSA), Ryan McCarthy (AUS)

77 — Robert Dinwiddie, An Byeong-Hun (KOR), Stewart Cink (USA), William McGirt (USA), Hideto Tanihara (JPN), a-Harry Ellis, Wang Jeung-hun (KOR), Fabrizio Zanotti (PAR), Sandy Lyle

78 — a-Maverick McNealy (USA), Louis Oosthuizen (RSA)

79 — Todd Hamilton (USA), David Duval (USA)

80 — Adam Hodkinson

81 — Mark O’Meara (USA)