Matt Kuchar is among a trio of players tied for top spot after the first round of the Mayakoba Golf Classic.
The American made seven birdies and no bogeys to card an opening round of 64 as he looks to bounce back from a disappointing season.
Graeme McDowell is tied 77th after a one-under 70 on day one while Seamus Power is one over after his 72.
Joining Kuchar at the top of the leaderboard are compatriots Kramer Hickok and Dominic Bozzelli, who both also hit bogey-free rounds at El Camaleon Golf Club in Mexico.
Bozzelli made four straight birdies on his second nine to propel him into contention.
A total of 15 players are sitting just a shot further back, with defending champion Patton Kizzire among those to hit an opening round of 65.
Kizzire made two eagles in a row on the front nine, holing out with a gap wedge on the par-4 sixth for his second.
Mexico's Abraham Ancer is also in the large group tied on 65, with a bogey on the par four 12th hole the only blemish in his round.
Three-time major winner Jordan Spieth, meanwhile, struggled to make an impression, hitting four birdies and four bogeys for an even-par 71.
Spieth is playing in Mexico via an arrangement made with the PGA Tour after he failed to qualify for the Tour Championship and therefore did not play the requisite 25 events.