Adam Scott's putting woes continued to plague him but the top-ranked Australian remains in contention after the second round of the penultimate US PGA tour playoff event in Indiana.
Scott fired a second consecutive four-under 68, his sixth straight round in the 60s, to move to eight under par at Crooked Stick Golf Club, five back of leader Vijay Singh.
Singh overshadowed the showdown between Tiger Woods and Rory McIlroy with a six-under 66 leaving the Fijian at 13-under par, one clear of the power duo and Ryan Moore.
Bo Van Pelt is joined by Lee Westwood just two off the lead in a tie for fifth at 11-under, leaving four players who have been No.1 in the world inside the top six.
Scott only needs a top 38 finish to advance to the season ending Tour Championship but needs a high finish this week to give him a legitimate chance at winning the FedEx Cup and the $US10 million ($A9.76 million) bonus.
The Queenslander rolled in five birdies in his round to just a lone bogey, gaining a stroke on all four par fives, as conditions remained soft and perfect for low scores. His putting remained the biggest roadblock to lower scores - after two rounds he is ranked 59th in the 70-man field.
The longest putt the 32-year-old made in round two was a birdie putt from 10 feet.
"I played fine, not quite as nice as yesterday but I played good," Scott said.
"I'm just not in any rhythm with the putter overall.
"I have a lot of looks at it and I'm not hitting enough good ones and then the good ones aren't really going in either.
"That's probably because I'm not hitting enough good ones."
With conditions staying soft the field is putting on a birdie blitz with just nine players over par. Scott is hoping he can make the most of 'moving day' and his broomstick putter cooperates.
"I just need to make some putts over the weekend and I'll be in good shape," he said.
"It would be nice if I could put a low one up tomorrow so I don't have to on Sunday.
"The field will slow down over the weekend, the leaders may not, but the field will so if I can go mid 60s or better for a couple of days it would be a good week and I'll be in there.
"I'm playing good enough to be in this. Everything is in good shape other than the putting."
John Senden and Geoff Ogilvy are the next best Australians at five-under par in a tie for 33rd.
Senden is flirting with FedEx Cup elimination, currently projected at 30th, the last man in to the Tour Championship in Atlanta.
Ogilvy needs to make a big move, needing a top four placing to advance.
The season is all but over for Greg Chalmers (even par) and Marc Leishman (+4) as both needed top six placings to survive and are tied 59th and 67th respectively.