Watson, the winner at Torrey Pines in late January, eagled the par-5 11th and had six birdies and two bogeys at TPC Louisiana. Jones had eight birdies and two bogeys.
Joe Durant, Tommy Gainey, Carl Pettersson, John Rollins, Nick O'Hern and David Duval opened with 67s.
Luke Donald, a playoff loser last week at Hilton Head in a failed bid to jump from No. 3 to No. 1 in the world, shot 68 to match Matt Bettencourt, Webb Simpson, Jason Dufner, Augusta native Charles Howell and 2002 winner K.J. Choi. Hilton Head winner Brandt Snedeker opened with 77.
EUROPEAN TOUR: In Seoul, South Korea, top-ranked Lee Westwood finished the first round of the Ballantine's Championship with a double bogey, falling six shots behind Damien McGrane.
Starting on the back nine, the Englishman birdied the 18th and was on course for 2-under 70 before his late slip at the ninth sent him tumbling down the leaderboard at the Blackstone Golf Club at Icheon. He finished at even-par 72.
NATIONWIDE TOUR: In Valdosta, Ga., Nicholas Thompson held a one-shot lead at 5-under-par through 11 holes when the first round of the South Georgia Classic was suspended by darkness after the event was delayed by rain.
Former Augusta State star Major Manning is at even-par through nine holes at Kinderlou Forest Golf Club. Former Atlanta Braves pitcher John Smoltz is 4 over through four holes.
NGA/HOOTERS TOUR: In McCormick, S.C., Phillip Pettitt Jr., and Patton Kizzire shot 9-under-par 63s to share the lead after the first round of the Savannah Lakes Village Classic.
Evans' Brett Munson had 70, North Augusta's Kyle Bradley shot 74 and Aiken's Stephen Poole had 77.
LPGA TOUR: In Mobile, Ala., Grace Park and Song-Hee Kim shot 5-under 67s to share the first-round lead in the Avnet LPGA Classic on The Crossings course at the Robert Trent Jones Golf Trail's Magnolia Grove complex.
Stacey Lewis was a stroke back at 68 along with Karen Stupples.