World number one Rory McIlroy is four shots behind American leader Tony Finau after a solid two-under opening round at the Memorial Tournament in Ohio.
Finau holed nine birdies and three bogeys in a stunning 66 on a blustery day with gusts of wind reaching 30mph.
Ryan Palmer hit a bogey-free 65 to sit one back, while Spain’s Jon Rahm is in a group on three under par.
Tiger Woods, playing his first event since the coronavirus break, birdied the first and 18th in a one-under 71.
The Muirfield Village course also hosted last week’s PGA Tour event, won after a play-off by Collin Morikawa on 19 under.
This week’s Jack Nicklaus-hosted tournament is not expected to be won by such a low score with the fairways and greens all running much faster than they were last week.
Only 24 players carded under par scores on a tough opening day, which was again played behind closed doors.
“It’s not even remotely close to the same,” said Justin Thomas, who was beaten by Morikawa in the play-off. He had four bogeys in a two-over 74 to match his entire total in last week’s event.
“It was a totally, totally different golf course,” Thomas added.
It had been hoped this event would be the first to allow spectators in to watch but the PGA Tour has decided to play the rest of the season without fans present as cases of coronavirus continue to soar in the United States.