Singh picked up where he left off in Hilton Head Island, SC. His 65 on the par-71 Harbour Town Links course was just one shot higher than his final-round score a year ago.
Last year, Singh followed his Masters victory with a tie for 3rd at the WorldCom, courtesy in large part to his Sunday 64.
Singh opened and closed in 69 in last weeks title defense at Augusta National. He finished tied for 18th.
Singh is in search of his first PGA Tour victory since he was awarded the Green Jacket in 2000. He has won twice, however, in 01, with both wins coming in Malaysia.
Singh called his first round a working mans 65.
Im playing 14, 15, 16 - great holes - but there are always one or two bad ones that pop up for me, said Singh, who hit only 10 of 18 greens in regulation, but managed to record six birdies and no bogeys.
Mayfair has five tour wins to his credit, but none since the 1998 Buick Open. The Buick was the second of two victories he posted three years ago. The first was the Nissan Open, where he defeated Tiger Woods in a playoff.
Thursday, Mayfair overcame a bogey at the par-4 10th, his first hole of the day, to card a 4-under-par 32 over his final nine holes.
Dunakey has yet to win in two full seasons on tour. Hes best known for shooting 59 in the second round of the 1998 Buy.Com Miami Valley Open.
As impressive as that round was, it ended with a three-putt bogey. It also ended in defeat, as Craig Bowden won the event.
Thursdays 65 included seven birdies and one bogey.
It was a long ways from a 59, but it was a pretty solid round, said Dunakey.
After winning his fourth consecutive major championship at the Masters, Woods isnt in this weeks field. Several other big names are; and many are in good position after Round One.
Rocco Mediate, Tom Lehman and Mark Calcavecchia each opened in 5-under-par 66 to finish the day one off the lead. Calcavecchia tied for fourth last week in Augusta, Ga.
Scott Hoch, Jeff Sluman and 1996 WorldCom winner Loren Roberts are in a group two back at 4-under-par.
Four-time champion Davis Love III is just three back after shooting 68. Hes tied for 21st place with Jesper Parnevik.
Full-field scores from the WorldCom Classic