Adam Hadwin on top, Scottie Scheffler one back at Memorial

Adam Hadwin of Canada racked up eight birdies and secured the first-round lead at the Memorial Tournament on Thursday at Muirfield Village Golf Club in Dublin, Ohio.

In a stacked field of 73 players at the $20 million signature event, Hadwin posted a 6-under 66 and leads World No. 1 Scottie Scheffler by one shot.

Xander Schauffele shot a bogey-free 4-under 68 for his first competitive round since winning the PGA Championship last month. He is tied for third with Collin Morikawa, Sweden's Ludvig Aberg and Canada's Corey Conners. Defending Memorial champion Viktor Hovland of Norway is one of five players tied at 3-under 69, and Rory McIlroy of Northern Ireland is part of a group at 2-under 70.

Hadwin, 36, is a top-60 player in the world but has just one PGA Tour win to his name, which came back in 2017.

Hadwin started his round with a downhill, 29-foot birdie putt at the first hole and added a 35 1/2-footer at the par-5 fifth. Those were two of his four birdies on the front nine before a bogey at No. 8. His four birdies on the back nine were much shorter, none longer than 5 feet, and he stood at 7 under before bogeying his last.

--Field Level Media