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Scotland's Russell Knox used a string of four consecutive birdies on the back nine to post a 7-under-par on 65 Thursday, good for a one-shot lead in the Valero Texas Open at TPC San Antonio.

Knox hit 12 of 14 fairways and 14 of 18 greens in regulation to take the pole position ahead of Denmark'sRasmus Hojgaard, who shot a 6-under 66.

Four players -- Matt Kuchar, Denny McCarthy, J.J. Spaun and England's Aaron Rai -- are