Rested after the Rio Olympics, Rafa Cabrera Bello shot a 7-under 63 on Thursday in the Wyndham Championship for a share of the first-round lead with Kevin Na.
Cabrera Bello eagled the par-5 fifth and closed the bogey-free round with a birdie on Sedgefield's par-4 ninth. On Sunday, the 32-year-old Spaniard tied for fifth in Rio.
Na had seven birdies in his bogey-free round in the PGA Tour's final regular-season event.
Luke Donald, Brandt Snedeker, Derek Fathauer, New Zealand Olympian Danny Lee and Peter Malnati shot 65. Donald made a hole-in-one on the 16th.
Jim Furyk had a 66 in his first round since shooting the first 58 in PGA Tour history two weeks ago in the final round of the Travelers Championship.