Former world number one Luke Donald shared the first-day lead at the RBC Heritage with an opening round of 66 at Hilton Head in South Carolina.
The 38-year-old, without a European or PGA win since 2012, has slipped to 95 in the rankings and recently revealed he considered retirement last year.
But the Englishman made just one bogey at the Harbour Town links, compiling six birdies to reach five under par.
Current world number one Jason Day is one shot behind.
Australian Day looked set to join Donald and South African world number 14 Branden Grace in the clubhouse at five under, but finished with a 67 after taking an unplayable lie in a bunker at the closing lighthouse hole and making his solitary bogey.
Donald, who failed to qualify for last week’s Masters for the first time since 2004, broke par for the 23rd time in his past 29 rounds at Harbour Town but is yet to win at the course.