Five days after describing winning the Open on the Old Course as golf's Holy Grail, Rory McIlroy will take a share of the lead into the final round of the 150th Championship following a stunning Saturday at St Andrews.
Buoyed by a brilliant eagle from a bunker on the 10th, McIlroy carded a superb third round of 66 to boost his bid to end an eight-year major drought and become the first European winner at St Andrews since Nick Faldo in 1990.
Only a bogey on the famous Road Hole 17th prevented McIlroy from holding the outright lead, with Ryder Cup team-mate and playing partner Viktor Hovland, chasing his first major title, carding a bogey-free 66 to join the Northern Irishman on 16 under.
McIlroy lifted the Claret Jug in 2014 and won his fourth major in the US PGA a month later, but has not won one of the game's biggest titles since.
Augusta National co-founder and three-time Open champion Bobby Jones famously said that a player's career would not be complete without lifting the Claret Jug on the Old Course.
"I have a lot of belief in myself, I know I can do it again."
And while McIlroy does not think that is strictly true, the world number two was well aware of the significance of winning the oldest major title at the Home of Golf.
"I don't know if a golfer's career isn't complete if you don't, but I think it's the Holy Grail of our sport," McIlroy said in his pre-tournament press conference on Tuesday.
Asked about the significance of winning on Sunday, McIlroy told Sky Sports: "It would mean everything because of what I have been through the last few years, trying to get the fifth one.
"I have a lot of belief in myself, I know I can do it again. I just need to go out in my own little world and shoot a good score that I know I can do around here."
Shane Lowry frustrated as putter problems follow eagle eyes
Australia's Cameron Smith had been in pole position to achieve that feat after posting a record halfway total of 13-under-par, but the world number six three-putted the opening hole and made a double bogey on the 13th as he slipped off the pace.
Even an error-free front nine of 33 - with birdies on the fifth, sixth and ninth - had seen McIlroy a shot behind an inspired Hovland, who had birdied four holes in a row from the third to take over from Smith at the top of the leaderboard.
However, McIlroy then holed out from a bunker short of the 10th green for a stunning eagle to vault into the lead, before Hovland commendably held his nerve to birdie the same hole.
McIlroy found the green in two on the 614-yard 14th to set up another birdie and move into the outright lead, only to then fire his approach to the daunting 17th over the green and off the wall.
The resulting bogey dropped McIlroy back alongside Hovland (pictured above), who brilliantly saved par from just over the green, with both players then making a birdie on the last.
Smith and Young will start the final round four shots behind after rounds of 73 and 71 respectively, with world number one Scottie Scheffler and South Korea's Si Woo Kim a stroke further back.
Two-time major winner Dustin Johnson is six shots back following a 71, with Tommy Fleetwood and US Open winner Matt Fitzpatrick on nine under with Australia's Adam Scott.
Shane Lowry is seven-under after a rollercoaster day ended in anticlimactic fashion. Back-to-back eagles nudged him to within four of the lead at one stage but he slumped thereafter to slip back.
Irish surprise package David Carey remains in the top 40 after a rollercoaster one-over round of 73 took him back to -4.
The qualifier from Dublin sunk five birdies but also had four bogeys and a double on the 17th.
