"I actually played really well after being four over after five," Fox said.
"I didn't really feel I had done a lot wrong but just hung in there. I had a little bit of luck. I chipped in for par on 18 and holed one from off the green on two for par, which kept everything going when it could have gone backwards. I certainly haven't played my way out of the tournament, which you could so very, very easily do out here.
"I was lucky to play with Matt Kuchar the last couple of days and he has played some great golf. I imagine if the conditions get better he is going to be a tough one to catch."
US PGA star and world No16 Kuchar showed his class with six birdies, easily the most carded by any player, balanced against six bogeys.
With the wind still howling around the Natadola Bay links, low scoring was at a premium, with just three rounds in red figures. Conditions are forecast to ease for the weekend.
-Peter White travelled to Fiji thanks to Fiji Airways and PGA Australia.