Paul Casey equalled a PGA Tour record as he carded just 27 shots during the back nine to put himself into contention on day two of the HP Byron Nelson Championship.
The Englishman finished the front nine on one over for the day and was looking unlikely to make the cut at TPC Las Colinas in Texas.
But after a remarkable six birdies and an eagle, completing the back nine in 27 shots, he now sits just two shots behind American leader Brendon Todd in tied second on a tight leaderboard.
Casey fired a one-over 71 during his opening round on Thursday and his front nine on Friday made it seem that the 36-year old wouldn't be making the weekend. Three bogeys and an eagle on the front nine left him on two-over and outside the projected cut line when he approached the 10th tee.
But birdies on that hole and repeated that feat on the 11th, 13th, 14th and 15th. An eagle on 16 and a closing birdie saw Casey equal a PGA Tour record.
He became just the eighth player in PGA Tour history to card a 27 over nine holes with his score just one shot behind Corey Pavin's front-nine record set at the U.S Bank Championship in 2006.
Casey admitted that his round escalated after his birdie after the turn.
"I had no concept of what I was doing," Casey told www.pgatour.com.
"The seal was broken when I got to 10. It just spiralled from there.
"I like to think I would be pretty good at shooting low rounds of golf through the past but certainly nothing like that."
Casey was ranked as high as third in the world in 2009 before injuries saw him plummet out of the top 150. But the player from Cheltenham is now working his way back up the rankings and is happy with the state of his game at the moment.
"The game is in really good shape," he said. "It doesn't guarantee good numbers but I'm enjoying playing golf and relishing the challenge every week.
"I'm hitting the ball a long way. I used to hit it a long way and it's been a couple of years since I've done that. I've really struggled."
Meanwhile, Todd remains clear of the rest of the field after following up an opening round of 68 with a six-under 64 to lead a large group two shots behind.
The 28-year old carded birdies on holes seven, eight, 10, 11 and 13 before his only bogey of the day on the par four 15th.
He went into the 17th hole level with the large pack on six under but two bogeys on the final two holes saw him take the two-shot lead into the weekend.
Those featured in the chasing pack alongside Casey include last week's Players Championship winner Martin Kaymer, American trio Morgan Hoffman, Tim Herron, Canadian duo Graham DeLaet and Mike Weir and Australian Marc Leishman.
Two shots further back is two-time Open championship winner Padraig Harrington with his second consecutive 68 with American Matt Kuchar and South Africa's Louis Oosthuizen.
After an impressive Players Championship, Jordan Spieth was in a group at three shot, one shot clear of overnight leader Peter Hanson who carded a disappointing three-over.
David Duval was just one shot off the lead after the opening day but was suffering from a reoccurring elbow injury and missed the cut by one shot after shooting six-over on Friday.
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