Jamieson, 27, had eight birdies in his round and just two bogeys. Four players – England’s Steve Webster, India’s Jeev Milka Singh, French rookie Romain Wattel and Spain’s Pablo Larrazábal – share second place after scores of 67.

Jamieson’s round is his second lowest since graduating onto the main Tour from the secondary Challenge Tour. His debut in the event started with two birdies in his opening three holes and after a bogey at his fifth Jamieson stormed into the leading pack with four birdies in five holes from his sixth.

The quietly spoken Jamieson then took the lead in hitting an 8-iron to eight feet at his 17th. He said: “It was a pretty good score considering I didn’t think I was hitting the ball all that well but then sometimes that can be a blessing in disguise. However I haven’t been able to play the last four weeks given my status didn’t qualify me for the events in Asia although I did get a late call up to play last week in Korea but it was going to be too costly so I didn’t travel.”

Instead, Jamieson has spent the past month in Jacksonville, Florida where he will be married on December 30th to his long-time American girlfriend. “I spent a lot of time playing about a dozen games at Palencia Golf Club in Jacksonville,” he said. “And we’ve planned the wedding reception to take place at TPC Sawgrass where they’re playing the Players Championship next week, so that’s going to be a buzz.”

Alvaro Quiros teeing off at the Spanish Open.

Jamieson will try to become the first Scot in 17 years to win the Spanish Open. The last one was Colin Montgomerie in 1994.

First round leaderboard:
1) Scott Jamieson (SCO) 66, -6
2) Romain Wattel (FRA) 67, -5
    Pablo Larrazábal (ESP)
    Jeev Milkha Singh (IND)
    Steve Webster (ENG)