Steve Bann coaches 2011 champion KJ Choi while his long-time business partner Dale Lynch has Na in his stable.
Scott was left to rue two double bogeys in his round.
The first came thanks to dunking his tee ball into water on the fifth hole and tghe other came on the last hole to sour his finish.
"Doubles are just so costly in this event and it was just unnecessary to finish that way," Scott said. "Overall it was a frustrating day for me."
Despite his odds lengthening considerably, the 31-year-old vowed to attack the tough Sawgrass layout on Sunday in an effort to steal a win.
"It's not over yet. I think a low round tomorrow can go a long way and if I can get to double digits (under par) then anything is possible out here," he said.
Scott admitted he needed to come out firing.
"The first four holes are gettable so I need to get it in the fairway and get at the pins. There is a chance to start hot and build something from there," he said.
"I have to go low and I'm ready to go for it and have a real run at it.
"I'm not just going to plod my way around and see what happens, I'm going to make something happen.
"Like I said, it's all in the start. If I can get off to a fast one then maybe I can ride the momentum all the way home."
Geoff Ogilvy (70) was the only Australian to post an under par round, moving to three under for the tournament in a tie for 27th.
Marc Leishman (even), Robert Allenby (+3) and Rod Pampling (+5) round out the Australian effort while Tiger Woods (72) couldn't get anything going on moving day, leaving the 14-time major winner at two-under in a tie for 34th.
-AAP