Irish amateur Paul Dunne is joint leader of The Open Championship heading into the final day at St Andrews, alongside former winner Louis Oosthuizen and Australia’s Jason Day.
On a day of benign weather and spectacular scoring, Dunne, 22, carded a six-under-par 66 for 12 under overall.
South Africa’s Oosthuizen, who won on the Old Course in 2010, carded a 67, as did world number nine Day.
American Jordan Spieth remained on course to win the first three major titles of the year after a third-round 66 left him 11 under.
Two-time champion Padraig Harrington (65) is fifth on 10 under, while the nine-man group one shot back includes Spain’s Sergio Garcia, English pair Justin Rose and Danny Willett, and Australia’s Adam Scott.
South Africa’s Retief Goosen, also on nine under after a 69, would become the oldest Open champion in history were he to win at St Andrews - he is 46 years and 167 days old on Monday, 162 days older than Old Tom Morris was when he won at Prestwick in 1867.
Overnight leader Dustin Johnson carded a 75, the second-worst round of the day, which saw him finish on seven under.