American Matt Kuchar missed a par putt on the last hole to miss out on the outright lead going into the final day of the Memorial Tournament in Ohio, with three players all on 14-under.
The 37-year-old won the event in 2013 and he looked to be in control on Saturday after another strong start.
He had surged into the lead after four birdies in five holes from the 11th but he found the sand on the last to give himself problems.
Kuchar was unable to recover and he eventually signed for a two-under-par 70, his worst round of the week so far.
His errors allowed compatriots Gary Woodland and William McGirt to join him at the top of the leaderboard. McGirt, 10.00 to win the event, has yet to win on the PGA Tour tour but he finished with a 64 to move up 21 places.
Woodland’s 69 also gave him a great chance of victory but a number of players are still hot on the trio’s heels.
Adam Hadwin, Dustin Johnson, Jon Curran and Emiliano Grillo are all on 13-under par while Soren Kjeldsen, Zac Blair and Kevin Streelman are just two shots off the lead.
Saturday’s play was suspended for over two hours due to bad weather but the players had enough time to complete their rounds before darkness at Muirfield Village.
However, more thunderstorms are expected for Sunday and tournament officials have now confirmed the players will play in threesomes in the final round.