Tiger Woods stumbled out of the gate but then roared to a course record nine-under 62 to take a commanding seven-shot lead into the final round of the BMW Golf Championship.
For the second consecutive day, the world number one opened his round with a bogey at the first but was error-free the rest of the way leaving the field in his dust and bettering the Cog Hill course record of 63 he had shared with six others.
American Brandt Snedeker (66) and Australian PGA Tour rookie Marc Leishman (68) are Woods nearest challengers but will not like their chances of reeling in Woods who has won 47-of-51 events when leading or sharing the lead after 54 holes.
A victory would give Woods his sixth title of the season and fifth at Cog Hill.
