Greg Chalmers, Steve Allan and John Senden are chasing leader Angel Cabrera in Sioux Falls, South Dakota.
Chalmers is tied for 6th after his three-under-par 67 on Friday, while Allan and Senden had a 68s.
Cabrera posted a bogey-free, six-under 64 to set the early pace.
He's one stroke ahead of South Africa's Retief Goosen, who birdied Nos. 10, 12, 14 and 16 for a late surge in his round of 65.
Tied for third are American Bo Van Pelt, New Zealand's Steven Alker and South Africa's Retief Goosen at 66. Spaniard Miguel Angel Jimenez, the Schwab Cup leader, is among five players tied at 67.
Aussies Stuart Appleby and Rod Pampling shot one-under 69s.
Compatriots Richard Green and Mark Hensby were even, with Brad Jones (71), Matthew Goggin (72), Michael Wright (72) and David Bransdon (75) all over the card.
Argentine Cabrera birdied three holes on each nine at Minnehaha Country Club, including Nos. 16 and 18, to card his low number.
The 56-year-old, a two-time major winner on tour this season, could jump into the top five in the Charles Schwab Cup points race with a win or a strong finish this week. He entered seventh in the standings.
John Daly signed for an 18-over-par 88 after scoring a 19 at the par-5 12th hole. He took seven penalty strokes in completing the hole.
With AAP.
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