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Australia's Cameron Smith surged into the lead at the halfway stage of the 150th Open Championship after a sensational eight-under-par second round of 64 on Friday left him on 13-under for the tournament at the halfway stage.
The world number six leads by two shots from Cameron Young, the overnight leader who shot a 69 on Friday to sit at 11 under par.
Rory McIlroy, the favourite coming into the week, built on his opening 66 to shoot a 68 and sit third on 10-under.
He was joined on a 134 total by Norway's world number nine Viktor Hovland, who posted a 66 on Friday.
Dustin Johnson, who went out early and posted a 67, is on nine-under.
Smith sat joint-third overnight after shooting a five-under-par 67 in his first round on Thursday.
He improved on that with the best score recorded by any player in the field on Friday, featuring six birdies, an eagle and no dropped shots.
Smith birdied each of the first three holes while his eagle came via an outrageous long putt at the par-five 14th.
Young, who opened with a 64, bogeyed the second hole on Friday but steadied himself after that and closed with a birdie on 18 to take sole possession of second place.
World number one Scottie Scheffler and England's Tyrrell Hatton, who went out together early in the morning, both moved onto eight-under at the halfway stage of the championship.
Masters champion Scheffler shot a second consecutive 68 while Hatton enjoyed a bogey-free 66 on Friday.
The last player to win the Masters and British Open in the same year was Tiger Woods in 2005.
Thriston Lawrence was the best-placed South African as he posted a 1-under 71 to sit tied for 24th at four-under heading into the weekend.
Collated second round scores in the 150th Open on the Old Course at St Andrews on Friday (GBR/IRL unless stated; Par 72):
131 - Cameron Smith (AUS) 67-64
133 - Cameron Young (USA) 64-69
134 - Viktor Hovland (NOR) 68-66, Rory McIlroy 66-68
135 - Dustin Johnson (USA) 68-67
136 - Tyrrell Hatton 70-66, Scottie Scheffler (USA) 68- 68
137 - Patrick Cantlay (USA) 70-67, Talor Gooch (USA) 68-69, Adam Scott (AUS) 72-65, Sahith Theegala (USA) 69-68
138 - Barclay Brown 68-70, Matthew Fitzpatrick 72-66, Lucas Herbert (AUS) 70-68, Sadom Kaewkanjana (THA) 71-67, Kim Si-woo (KOR) 69-69, Min-Woo Lee (AUS) 69-69
139 - Abraham Ancer (MEX) 71-68, David Carey 72-67, Thomas Detry (BEL) 70-69, Yuto Katsuragawa (JPN) 71-68, Xander Schauffele (USA) 69-70, Lee Westwood 68- 71, Aaron Wise (USA) 72-67
140 - Nicolai Hoejgaard (DEN) 73-67, Brad Kennedy (AUS) 68-72, Kim Joo-hyung (KOR) 69-71, Thriston Lawrence (RSA) 69-71, Shane Lowry 72-68, Victor Perez (FRA) 71-69, Jon Rahm (ESP) 73-67, Patrick Reed (USA) 72-68, Jordan Spieth (USA) 71-69, Harold Varner III (USA) 73-67, Will Zalatoris (USA) 73-67
141 - Sam Burns (USA) 72-69, Filippo Celli (ITA) 74-67, Tommy Fleetwood 72-69, Dylan Frittelli (RSA) 70-71, Sergio Garcia (ESP) 75-66, Brian Harman (USA) 73-68, Garrick Higgo (RSA) 72-69, David Law 72-69, Ian Poulter 69-72, Kurt Kitayama (USA) 68-73
142 - Laurie Canter 72-70, Corey Conners (CAN) 71-71, Russell Henley (USA) 70-72, Billy Horschel (USA) 73-69, Jason Kokrak (USA) 72-70, Thomas Pieters (BEL) 75-67, Justin Thomas (USA) 72-70, Cameron Tringale (USA) 71-71, Danny Willett 69-73
143 - Marcus Armitage 71-72, Paul Casey 71-72, Bryson DeChambeau (USA) 69-74, Chris Kirk (USA) 75-68, Hideki Matsuyama (JPN) 71-72, Adrian Meronk (Pol) 75-68, Joaquin Niemann (CHI) 69-74, John Parry 69-74, Anthony Quayle (AUS) 74-69, Jamie Rutherford 73-70, Jason Scrivener (AUS) 72-71
144 - Adria Arnaus (ESP) 74-70, Sam Bairstow 72-72, Christiaan Bezuidenhout (RSA) 73-71, Dean Burmester (RSA) 71-73, Wyndham Clark (USA) 71-73, Justin de Los Santos (USA) 71-73, Robert Dinwiddie 67-77, Tony Finau (USA) 73-71, Im Sung-jae (KOR) 71-73, Aaron Jarvis (CAY) 75-69, Kevin Kisner (USA) 74-70, Robert MacIntyre 70-74, Richard Mansell 73-71, Francesco Molinari (ITA) 73-71, Sebastian Munoz (COL) 73-71, Jordan Smith 73-71, Lars van Meijel (NED) 74-70, Trey Mullinax (USA) 71-73
The following players missed the cut:
145 - Ben Campbell (NZL) 74-71, Ernie Els (RSA) 70-75, Justin Harding (RSA) 74-71, Max Homa (USA) 73-72, Takumi Kanaya (JPN) 74-71, Zander Lombard (RSA) 77-68, Keith Mitchell (USA) 76-69, Collin Morikawa (USA) 72-73, Louis Oosthuizen (RSA) 71-74, Webb Simpson (USA) 71-74, Henrik Stenson (SWE) 75-70, Scott Vincent (ZIM) 69-76, Jamie Donaldson 76-69, Brandon Wu (USA) 71-74
146 - Alexander Bjoerk (SWE) 75-71, Richard Bland 78-68, Ryan Fox (NZL) 71-75, Matthew Griffin (AUS) 74-72, Emiliano Grillo (ARG) 78-68, Matthew Jordan 74-72, Chan Kim (USA) 74-72, Lee Kyoung-hoon (KOR) 69-77, J. T. Poston (USA) 73-73
147 - Keegan Bradley (USA) 76-71, John Catlin (USA) 74-73, John Daly (USA) 73-74, Matt Ford 71-76, Padraig Harrington 69-78, Zach Johnson (USA) 72-75, Guido Migliozzi (ITA) 73-74, Keita Nakajima (JPN) 72-75, Shaun Norris (RSA) 74-73, Aaron Rai 75-72
148 - Ashley Chesters 75-73, Cho Min-gyu (KOR) 75-73, Mackenzie Hughes (CAN) 73-75, Brooks Koepka (USA) 73-75, Kevin Na (USA) 72-76, Seamus Power 73-75, Bernd Wiesberger (AUT) 72-76, Rikuya Hoshino (JPN) 75-73
149 - Stewart Cink (USA) 78-71, Kazuki Higa (JPN) 73-76, Kim Svn-hwan (USA) 76-73, Li Haotong (CHN) 73-76, Luke List (USA) 76-73, Phil Mickelson (USA) 72-77, Marco Penge 76-73, Guillermo Mito Pereira (CHI) 75-74, Fabrizio Zanotti (PAR) 72-77
150 - Harris English (USA) 76-74, Oliver Farr 76-74, Tom Hoge (USA) 74-76, Kim Min-kyu (KOR) 73-77, Marc Leishman (AUS) 76-74, Aldrich Potgieter (RSA) 74-76, Gary Woodland (USA) 74-76
151 - Stephen Dodd 77-74, Jorge Fernandez Valdes (ARG) 74-77, Paul Lawrie 74-77, Ronan Mullarney 73-78, Dimitrios Papadatos (AUS) 77-74
152 - Sam Horsfield 76-76, Shugo Imahira (JPN) 80-72
153 - Sepp Straka (AUT) 81-72, Tiger Woods (USA) 78-75
154 - Darren Clarke 79-75, Jack Floydd 75-79
155 - Jediah Morgan (AUS) 79-76, Alex Wrigley 82-73
156 - David Duval (USA) 82-74, Pablo Larrazabal (ESP) 75-81
165 - Mark Calcavecchia (USA) 83-82
