Troy Merritt chipped in for eagle on his way to a 6-under 66 that gave him a two-shot lead over the early starters in the second round of the Memorial.
Merritt was at 9-under 135, two shots ahead of a large group that included Patrick Cantlay, Adam Scott and Rickie Fowler.
Also at 9 under was Emiliano Grillo, who had the lead until a bogey on the 17th and a wedge on the 18th that he was trying to get close to save par and wound up making double bogey.
Phil Mickelson started with a triple bogey and matched his worst score at Muirfield Village with a 79 to miss the cut.
Tiger Woods, seven shots behind when he teed off, played in the afternoon.