Sergio Garcia joined Charley Hoffman atop the Masters leaderboard on Friday, as Rickie Fowler moved firmly into contention during the second round at Augusta.
Hoffman was four clear overnight following a sensational 65 and reached eight under with a birdie at the second when he returned to the course for round two.
However, the unheralded American then undid much of his good work with a run of five bogeys in six holes from the sixth.
And although Hoffman recovered to birdie the par-five 13th before finishing with five pars for a 75 that left him four under, his mid-round slump enabled Garcia to claim a share of first place.
The affable Spaniard, who boasts 22 top-10 finishes in a major without tasting success, birdied his first three holes after beginning the day one under.
Three bogeys followed either side of Garcia's next gain on the ninth, including a five at the par-four 10th that was wrongly reported as a seven on the official Masters leaderboard before a correction was issued.
However, Garcia then finished strongly, picking up shots at 15 and 17, and would have led outright at five under had he not missed a short birdie putt on the last, which ensured he carded a 69.
The leading pair were one clear of Fowler, who started par, eagle, birdie and then moved to three under by picking up another shot at the long eighth.
William McGirt was two off the pace following a 73, while Ryan Moore's bogey-free 69 lifted him to one under.
Alongside Moore was Masters rookie Jon Rahm, who outshone playing partner Rory McIlroy by shooting 70 compared to the Northern Irishman's 73. McIlroy ended the day one over following some outrageous misfortune on the last, when his approach shot hit the flag and bounced off the front of the green, leading to a bogey.
Adam Scott, the hottest man on the course after a four-under front nine, Thomas Pieters, Phil Mickelson, Justin Rose and 1992 Masters champion Fred Couples were the other players in red figures - sharing fifth with Moore and Rahm.
Jason Day was one under for his round and one over for the tournament through five holes of his second round, but Jordan Spieth remained off the pace - three further back and eight adrift of the lead.
Reigning champion Danny Willett was set to miss the cut after a six-over 78 left him seven over. Willett's round began with a horrendous eight on the first, where he hit a shank into the trees before enduring misery around the green.
The winner of last year's Open, Henrik Stenson, was also well down the field at plus eight, after following his opening 77 with a 75.