The teams of Bubba Watson-J.B. Holmes, Nick Price-Tim Clark and Brad Faxon-Mike Weir opened with 61s in the two-day, best-ball tournament.
Sluman, a late replacement for the injured David Toms, tied for sixth Sunday at the U.S. Open at Winged Foot, three strokes behind winner Geoff Ogilvy. Cink tied for 37th.
'There's no question about it, that place wears you out,' Sluman said of Winged Foot. 'I was grinding it out the best I could and after I drove up here, I was extremely tired. We just had some fun today.
'There's no pressure here when your partner plays like Stew. He had eight birdies and an eagle. I was just along for the ride.'
Cink eagled the 414-yard, par-4 15th hole and accounted for eight of the duo's 10 birdies on the Rhode Island Country Club course.
Holmes, a tour rookie, and Watson, a second-year pro, stole the show with their booming tee shots. Watson leads the PGA Tour in driving distance at 319.3 yards, and Holmes is second at 311.9 yards.
Watson eagled the 516-yard, par-5 eighth hole, hitting his 6-iron approach shot to 10 feet.
'I don't always play this well but I had a real good front nine,' Watson said. 'But if I hit my drive bad, I hit it bad. If I putt bad, I putt bad. I make a living hitting a little white ball. This is what I can do to help charities.'