U.S. Open champion Webb Simpson opened with a 7-over par 79 that left him "disappointed" in his first competitive round in a month.
Simpson shot 6-over par 42 on the front nine with a double bogey on the third hole and four bogeys in his last five holes before making the turn.
"I was rustier than I thought I'd be," said Simpson, who took a month off for the birth of his daughter last month. "I didn't hit a bad shot on No. 1 and make bogey. At No. 3, I thought my wedge shot would be 10 feet, went over the green and I made double. Just kind of rusty stuff from there."
Simpson had three 3-putts on the back nine.
"It's a tough way to get back into it but I'm glad I got the first round under my belt. I'm not quite out of it," Simpson said.
"As hard as I worked at home, I didn't expect to come out here and struggle so much. I hit it really good today. Just stupid mistakes and couldn't get anything going. Seemed like every time I'd make a birdie, I'd make a mistake the next hole.
"I didn't feel nerves this morning like I thought I would. That's a dangerous place because I felt like I was floating out here."
The Charlotte-based players were led by Brendan de Jonge and Martin Laird, who opened with 71s while Robert Karlsson had 74 and Johnson Wagner shot 75. Pinehurst teaching pro Kelly Mitchum shot 76.