Craig Lee of Scotland shot a 10-under 61 to surge into a two-shot lead after the third round of the European Masters on Saturday.
Lee birdied the first six holes, and had 11 birdies overall, to equal the lowest round in a European Tour event this year. The 348th-ranked Lee was at 16-under 197.
Three players were tied for second: Thomas Bjorn, the 2011 champion from Denmark, Alejandro Canizares of Spain and Frenchman Victor Dubuisson.
Lee has never won a European Tour event, and says it was "comfortably my best round ever."
Miguel Angel Jimenez of Spain and Tommy Fleetwood of England both shot 69 to sit five shots behind Lee in a tie for fifth place.
Richard Finch of England made a hole-in-one at the 208-yard 13th.