Canadian lefthander Mike Weir fired a course record-tying 10-under-par 62 for a two-shot lead after the first round of the PGA Tour's Genuity Championship in Miami, Flordia on Thursday.

Weir made two eagles en route to a blistering 29 on the front nine.

Glen Day and Stewart Cink also played bogey-free golf, but finished two shots off the lead after each posted eight birdies for an eight-under 64.