Matteo Manassero and Ryan Fox each shot 6-under 64 on Saturday to share the third-round lead in the RBC Canadian Open, the final event before the U.S. Open next week at Oakmont

Italian veteran Matteo Manassero was poised to challenge for his first US PGA Tour title after conjuring seven birdies in a six-under par 64 to share the 54-hole lead at the Canadian Open with New Zealand's Ryan Fox.