Russell Knox shot a 6-under 65 on Thursday at breezy and wet El Camaleon Golf Club to take the first-round lead in the PGA Tour’s Mayakoba Golf Classic.

The 35-year-old Scot birdied five of the last six holes on his opening nine, then played the final nine in 1 under with a bogey on the par-4 second and birdies on the par-5 fifth and par-4 sixth.

Chile’s Joaquin Niemann was a stroke back with Argentina’s Emiliano Grillo and American Tom Hoge. Niemann is donating his entire prize money and $5,000 for every birdie and $10,000 for an eagle to help pay for a drug for his 2-month-old relative in Chile.

Niemann also finished on the front nine, making birdies on Nos. 3, 5, 6 and 7.

Knox has two victories on the PGA Tour and one on the European Tour. He lost in a playoff at Mayakoba in 2016.

Carlos Ortiz, the Mexican star playing for the first time as a PGA Tour winner, was two strokes back at 67. He won the Houston Open a week before the Masters and did not play at Sea Island.

Defending champion Brendon Todd also was at 67 with Tony Finau, Viktor Hovland, Aaron Wise, Nate Lashley, Akshay Bhatia and Michael Gligic.

Former U.S. Amateur champion Andy Ogletree, the low amateur at the Masters, had a 69 in his pro debut. Ryder Cup captain Steve Stricker also shot 69.

Rickie Fowler had a wild round of 70 with eight birdies and quadruple and double bogeys. He played the final six holes in 4 under to get under par.

Four-time major champion Brooks Koepka had a 71. Justin Thomas shot 72. At No. 3, he’s the only player from the top 10 in the world in the field.