Martin Flores and Angel Cabrera lead the way at the Wells Fargo Championship on a day where Brendon de Jonge carded a 62 to equal a course record at Quail Hollow.
De Jonge had began the day in last place after shooting an 80, 8-over par, on Thursday but remarkably beat his first round score by 12 shots during day two.
The Zimbabwean is now back to two-under for the tournament and is only seven shots off the lead. His efforts equalled the course record set by Rory McIlroy who carded a 62 during his final-round of his first career PGA victory in this tournament in 2010.
De Jonge, who hit eight birdies and an eagle, was happy that he made amends for his poor first round.
"I wish I could go into every round with that kind of a mind set, but it's easier said than done," De Jonge said on pgatour.com.
"As horrible as yesterday was, today was as nice. So this game gives you something and takes something away."
Things could have been even better for the 33-year old as an 18-foot putt on the final hole represented a chance to make a course record 61, but he narrowly missed.
De Jonge admits he wasn't expected to make the cut but is now looking forward to competing over the weekend.
"I knew I had to keep going really just to make the cut, so I had that mind set all day that I needed to get out and get as far under par as possible and thank goodness it worked out," De Jonge added.
"To be honest, I didn't expect to be playing this weekend, so everything is a bonus. I have to do a good job of starting fresh tomorrow and realizing that it's a new round."
The player who shares De Jonge's course record, McIlroy, doesn't look likely to repeat his triumph from four years ago.
The Northern Irishman hit a 76 during a nightmare round after back-to-back double bogeys at holes three and four with bogeys at two, six and 16.
However, McIlroy carded three birdies to see him just make the cut by one shot on one-over par for the tournament. He began the day just three stokes off the lead but is now eight shots behind.
Mickelson also shot a disappointing second round after a promising first round when he shot a 75 to leave him at three-under.
The tournament has been much kinder to Argentinian Cabrera whose rounds of 66 and 69 has given him a share of the lead. He began the second day one shot clear but has been joined by American Flores.
A run of four birdies in five holes on the back nine saw Cabrera clear by a shot but a bogey on the final hole gave him a share of the lead. It means Cabrera will play the weekend for just the third time in 10 starts this season.
Flores' second round score of 68 was added to his opening round of 67 to see him joint with Cabrera on nine-under.
England's Justin Rose is in contention after his second round 67 has put him just one stroke off the leaders while American duo Shawn Stefani and JB Holmes are a shot further back.
Scotland's Martin Laird is on five under but England's Lee Westwood didn't make the cut as he shot a 76 to add to his 71 to leave him at three-over.
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