Jason Day and Matt Jones are four shots adrift of leader Collin Morikawa after the opening round of the PGA's Workday Charity Open.
Both Australians had opportunities to be closer to the top of Thursday's leaderboard, but eventually settled for a tie of 18th at the Muirfield Village Golf Club in Dublin.
Jones, in particular, was two behind Morikawa's seven-under round of 65 before registering bogeys on 16 and 17.
Former world No.1 Day's round of 69 included six birdies and three bogeys.
Marc Leishman's even-par 72 leaves him in 64th, but Cameron Davis (73), Aaron Baddeley (74) and Cameron Percy (76) will all have to play well to make the cut.
American Morikawa's deft iron play and hot putter helped him to a one stroke lead over Canadian Adam Hadwin.
The 23-year-old, making his debut at the Muirfield Village Golf Club, would have enjoyed a two-stroke advantage but his putt on 18 came up agonisingly short and was forced to settle for his lone bogey of the day.
But he wasn't discouraged by how his round ended.
"It happens, I think it was just slight fatigue," he said.
"If I look at the entire day it was very consistent and I can take a lot of positives heading into tomorrow."
Canadian Nick Taylor, Japan's Hideki Matsuyama and Americans Zach Johnson and Aaron Wise lurk two back after rounds of 67.
World No.5 Brooks Koepka, who has not competed since his caddie tested positive for COVID-19 two weeks ago, struggled on the front nine and ultimately had to settle for a two-over 74 at the Jack Nicklaus-designed layout.
Three-times major winner Jordan Spieth battled back from a rough start to finish at even par while Phil Mickelson's solid start was undone by a disastrous back nine where he had four bogeys and a double for a one-over 73.
This week's event is being played at Ohio's Muirfield Village in place of the John Deere Classic, which was supposed to be held in Illinois but was cancelled due to state-related challenges regarding the COVID-19 pandemic.