Augusta, April 8: Defending champion Dustin Johnson failed to hit the ground running in testing conditions when he started the defence of his Masters title on Thursday.
Johnson donned the green jacket for the first time last November, finishing the tournament on a record-breaking 20 under par.
The world number one made only four bogeys as he blew the field away in the 2020 major at Augusta, but he dropped two shots in his opening five holes five months later, with patrons returning under blue skies.
Birdies were at a premium when the tournament got under way on much quicker, firmer greens than those seen in last year's tournament.
Two-time major champion Johnson started by dropping a shot after running through the first green with his second shot. Although he hit straight back with a birdie at the par-five second, Johnson was back at one over after failing to sink a par putt at the fifth.
Hideki Matsuyama led the way on three under through eight holes after draining an eagle putt at the eighth, with Christiaan Bezuidenhout and Si Woo Kim just a shot behind.
New father Jon Rahm, Patrick Reed and Paul Casey were among a host of players on one under following early birdies.
The recently in-form Lee Westwood was struggling on three over through six after a double bogey at the third, while Rory McIlroy dropped to one over with a dropped shot at the fifth and Brooks Koepka was level par eight holes into his first round.