Chopra, who missed a PGA Tour card by finishing just outside the top 20 on the Nationwide Tour money list in 2003, played the Panther Lake course and tallied three birdies on the outward half to make the turn at 3 under.
The 29-year-old added two birdies under windy conditions on the back side for his share of first.
'It seems some of my best rounds come in the toughest conditions and today they were really though,' said Chopra. 'It was a good solid start for me.'
Gronberg played the back nine first at the Crooked Cat layout at Orange County National at picked up his first birdie of the day at the par-4 12th. Gronberg added two birdies and a bogey over his next six holes before picking up an eagle at the par-5 first.
The Swede then birdied the second and reached 6 under with a birdie at the fourth. Gronberg found trouble with a bogey at the par-4 seventh, however, to fall back into a tie for first.
'I would love to play over here,' said Gronberg, who played four times on the PGA Tour in 2003. 'My wife is an American and my son was born over here.'
Briggs jumped out of the gate at Panther Lake with birdies on each of his first two holes.
He stumbled with a bogey at the par-3 sixth but caught fire with four birdies on the back side for a 67 of his own.
'I got off to a great start with birdies on the first two holes,' said Briggs. 'Then the wind started howling and the course got extremely difficult. But in this tournament you just have to stay patient and take it one day at a time.'
Kris Cox, Brian Bateman and Bradley Hughes share fourth place at 4-under-par 68.
Olin Browne was one shot further back at 3-under-par 69. Browne was joined by Charles Warren, Todd Hamilton, Jon Mills, Jim Rutledge, Jeff Freeman, David Branshaw, Gavin Coles and Jason Enloe in a tie for seventh.
Per-Ulrik Johansson, D.J. Trahan and Jay Delsing were part of a group at 2-under-par 70.
This marathon event features six rounds of tournament play with the top 30 and ties earning their PGA Tour cards for 2004.