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Associated Press
Camilo Villegas hits off the ninth tee of the Jack Nicklaus Private Course at PGA West during the first round of the Humana Challenge PGA golf tournament Thursday, Jan. 19, 2012, in La Quinta, Calif. (AP Photo/Ben Margot)

LA QUINTA, Calif. — David Toms and Colombia's Camilo Villegas shot 9-under 63 to top a leaderboard dotted with impressive scores in the opening round of the Humana Challenge on Thursday.

Ted Potter Jr., Sang-moon Bae and Brandt Snedeker were one stroke behind at 8 under in postcard-perfect weather on the pro-am tournament's three generous Palm Springs-area courses.

Villegas and Toms both played bogey-free golf at the erstwhile Bob Hope Classic, which acquired a new title sponsor and dropped one day of its traditional five-round format this year.

Toms shook off an unimpressive start to his season in Hawaii with excellent play alongside Phil Mickelson at the La Quinta Country Club, which features the tournament's toughest course. Mickelson struggled to a 74.

Villegas made nine birdies in his season and tournament debuts.

VOLVO GOLF CHAMPIONS: At George, South Africa, Nicolas Colsaerts of Belgium opened with a course record 9-under-par 64 to lead the first round of the Volvo Golf Champions at The Links at Fancourt on Thursday.

Colsaerts has a four-stroke lead over South Africa's Branden Grace and Thomas Aiken and England's Tom Lewis.

The previous course record was 68 set by Tim Clark and Ross Fisher in the first round of the 2005 South African Open.

Padraig Harrington showed glimpses of a return to form with a 69, despite a double-bogey 7 at the last hole.