David Toms and Chad Campbell made nine consecutive birdies to also finish the day at 11-under on the 6,688-yard Rhode Island Country Club. The tournament record for the first round is 58, set by Brad Faxon and Gary Player in 2001.
Jeff Sluman and Rocco Mediate were third, two strokes back, after the first round.
The Haas tandem was playing together for the first time since Bill, a two-time All-American, turned pro earlier this month.
'Today was a great thrill for me from the start, playing with my son,' the elder Haas said. 'I get nervous for him, wanting him to do well.
'But as far as him hitting good shots, I've got confidence that he's going to hit good shots.'
The younger Haas said he was nervous - and not because he was playing with his father. Hall of Famer Arnold Palmer also was in their foursome.
'I never played with Mr. Palmer before and I was probably more nervous on the tee than I have been because of him,' Bill Haas said. 'Just having my dad there did make it a bit easier.'
Jay Haas, who made his Champions Tour debut this year, made eagle on the par-5, 516-yard eighth hole and hit a 12-foot putt for birdie on No. 18 that gave them a 60.
Toms, a 10-time PGA Tour winner, and Campbell birdied every hole from No. 7 to No. 14. They shot 6-under 29 on the back nine - the lowest nine-hole score of the day.
'My partner made seven or eight of them (birdies),' Toms said. 'Chad got us off to a great start.'
Billy Andrade and Palmer finished four strokes behind the leaders, but the 74-year-old golf great again proved to be a crowd favorite and rolled in a 30-foot birdie putt on the 17th hole.
'The birdie was my contribution,' said Palmer, who shot a 75 Sunday at the Bank of America Championship in Concord, Mass., despite leg and back problems.
'I'm almost happy that I can play at all, and walk,' Palmer said. 'I've walked for six day in a row, 18 holes every day.
'That's a lot of walking, a lot of golf. Every once in a while I feel like I can do it, but it just doesn't always happen.'
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