ANCASTER, Ontario — Scott Piercy kept his cool in the rainy first round of the Canadian Open.

Instead of beating up himself, the quick-tempered American roughed up defenseless Hamilton Golf and Country Club, shooting an 8-under 62 on Thursday to take a one-shot lead.

Piercy eagled the par-5 fourth and 17th holes and had five birdies and one bogey in the rainy conditions to match the competitive course record set by Warren Sye in the third round of the 1991 Ontario Amateur. The 33-year-old Las Vegas player is coming off a third-place finish two weeks ago in the John Deere Classic.