St Andrews - Jimmy Mullen continued his remarkable professional debut as the Walker Cup star retained a share of the lead on Friday at the halfway stage of the Alfred Dunhill Links Championship.
Englishman Mullen, who won all four of his matches for Great Britain and Ireland in a record Walker Cup win over the United States at Royal Lytham last month, carded five birdies and two bogeys in a second round 69 at St Andrews.
"I was just out there trying to enjoy it and learn, and to be at the top of the leaderboard is, I can't really explain," said Mullen, in quotes published on the European Tour website.
"I know I've played the easier of the courses. I'm playing Carnoustie tomorrow (Saturday) so I knew I had to do two good rounds in the first two days to take a bit of the pressure off myself," he added.
The 21-year-old was joined at the top of the leaderboard on 11-under par by compatriot Anthony Wall, who reeled off five birdies over the back nine for an eight-under round of 64.
Irishman Paul Dunne, who like Mullen has also just joined the paid ranks, was part of a group of four golfers lying one stroke off the lead.
Dunne, who shared the lead after 54 holes of the British Open on the Old Course in July, sank three birdies with just one dropped shot in a round of 70 that left him tied with Jamie Donaldson, Chris Stroud and Thorbjorn Olesen -- all of whom made hay on the Kingsbarns course.
South Africa's Garth Mulroy was one shot further back with last year's US Open champion Martin Kaymer the leading name in a five-strong group three strokes off the overall pace.
Leading second round scores in the European Tour's Alfred Dunhill
Links Championship at St Andrews, Kingsbarns and Carnoustie on Friday
(GBR/IRL unless stated, par 72):
133 - Jimmy Mullen 64-69, Anthony Wall 65-68
134 - Paul Dunne 64-70
135 - Garth Mulroy (RSA) 67-68
136 - Benjamin Hebert (FRA) 69-67, Nathan Holman (AUS) 68-68
137 - Morten Orum Madsen (DEN) 70-67, Soren Kjeldsen (DEN) 65-72, James Morrison 67-70
138 - Adrian Otaegui (ESP) 68-70, Moritz Lampert (GER) 67-71
134 - Jamie Donaldson 69-65, Chris Stroud (USA) 68-66, Thornjorn Olesen (DEN) 68-66
136 - Bradley Dredge 73-63, Martin Kaymer (GER) 68-68
- Branden Grace (RSA) 73-64, Christiaan Bezuidenhout (RSA) 72-65,
Graeme Storm 69-68, Graeme McDowell 68-69, David Lingmerth (SWE) 71-66,
Marc Warren 68-69
138 - Stewart Cink (USA) 73-65, Kiradech
Aphibarnrat (THA) 75-63, Mikko Ilonen (FIN) 71-67, Scott Piercy (USA)
69-69, Bernd Wiesberger (AUT) 70-68
139 - Ernie Els (RSA) 72-67, Darren Clarke 71-68
141 - Luke Donald 71-70
142 - Charl Schwartzel (RSA) 72-70, Victor Dubuisson (FRA) 74-68
143 - Lee Westwood 71-72
136 - Alejandro Canizares (ESP) 69-67
138 - Florian Fritsch (GER) 68-70, Kristoffer Broberg (SWE) 64-74
139 - Stephen Gallacher 67-72
140 - Mark Foster 68-72, David Drysdale 68-72, Felipe Aguilar (CHI) 67-73, Robert Dinwiddie 71-69
141 - Hennie Otto (RSA) 70-71, Jbe Kruger (RSA) 73-68, Edouard Espana (FRA) 73-68, Peter Uihlein (USA) 69-72
145 - Paul Lawrie 70-75