Will Claxton fired a five-under par 66 to top a log-jammed leaderboard after the first round of the US PGA Tour's Mayakoba Golf Classic.
Claxton on Thursday played the Greg Norman-designed El Camaleon course without a bogey. He teed off on 10 and four of his five birdies came in a burst from the second through the fifth holes.
The 30-year-old had a one-shot lead over a group of seven players -- Mark Anderson, Spain's Alejandro Canizares, Matt Every, Charles Howell, John Huh, England's Greg Owen and Marc Turnesa.
A group of eight players on 68 included South Korean's Noh Seung-yul and Sunghoon Kang, as well as Canadian David Hearn.
Australian great Norman posted a 79 in the windy conditions on the course he designed.
European Ryder Cup captain Jose Maria Olazabal of Spain carded a 72.
The $3.7 million US PGA Tour event is played opposite the World Golf Championships Match Play Championship in Arizona, which drew the top golfers in the world this week.