Americans Peter Malnati and Jason Kokrak, and Chile's Joaquin Niemann shot rounds of eight-under 62 to share the lead after day one of the Sony Open in Hawaii.
Malnati grabbed five birdies to one bogey to turn at four-under, before birdying four of his last seven holes in a flawless homeward nine.
Kokrak played very steady golf, with four birdies on each nine in a blemish-free round.
Niemann was a touch more spectacular, birdying four of his last five holes on the front nine, then three of his next seven to compensate for a bogey five on the 12th, before sinking a 50-foot putt for an eagle three at the 18th.
The trio ended the day two shots ahead of six players sharing fourth place, including Australian Aaron Baddeley and Si Woo Jim of South Korea.
Sweden's Henrik Norlander and Taiwan's Cheng Tsung Pan were among a large group a further shot back after five-under 65s.
Ireland's Seamus Power sits back on level par after a mixed round. Power hit an eagle on the ninth and a birdie on the tenth in a short purple patch, but three bogeys saw him eventually sign for a round on 70.