Oosthuizen's 69 puts him 15-under par for the tourney, four strokes ahead of Paul Casey going into Sunday's final round at St. Andrews in Scotland.
Louis Oosthuizen waves to the crowd on the 18th green after completing his third round of the British Open.St. Andrews, Scotland — Louis Oosthuizen shot a 3-under 69 and will go to the final round of the British Open with a four-stroke lead.
The South African's total is 15-under 201. His closest challenger is England's Paul Casey, whose 67 left him at 205 overall Saturday. No one else is within seven shots of Oosthuizen (pronounced WUHST'-hy-zen), who failed to make the cut in three previous Open appearances.
Tiger Woods struggled to a 73 that left him a dozen shots behind, giving him little hope of winning a third straight Open at St. Andrews. He had dominating victories in 2000 and 2005.