Ireland's Padraig Harrington shot a four-under 66 to put himself right in the mix heading into Sunday's final day of the Byron Nelson Championship, as he trailed by two from South Africa's Louis Oosthuizen and American Brendon Todd.
2010 Open winner Oosthuizen has never won a PGA Tour event in America, but his superb 64 saw him seal a place in the final group alongside world number 138 Todd, who birdied the 18th for a 68.
Fellow American's James Hahn (65) and Gary Woodland (66) sit one back of the leaders on minus nine, while 2003 Masters champion Mike Wear is tied third alongside them as he looks for his first win since 2007.
Another Canadian Graeme DeLaet, and Australia's Marc Leishman, are with Harrington at eight under, but last week's Players champion Martin Kaymer couldn't follow up his consecutive 67s on the first two days and his round of one over saw him slip five off the pace - but my no means out of it.
A low-scoring Saturday saw 41 competitors break par with a host of top names including the in-form Matt Kuchar and Fiji's three-time major winner Vijay Singh pull within five of the lead at the TPC Four Seasons Resort.
America's 2008 Ryder Cup hero Boo Weekley backed up Friday's 68 with the same total taking him to within three of his compatriot Todd and the impressive Oosthuizen.
The South African recovered from a horrible start that saw him slip to two over for his round after just four holes in Irving, but a hat-trick of birdies followed to set up a sensational charge on the inward nine.
Immediately after the turn he made another gain at the par-four tenth, but the real fireworks were about to be sparked on the closing stretch as Oosthuizen made four birdies in his final five holes. He completed another hat-trick of gains from 14 to 16 before one more at the last saw him clinch a share of the lead.
Todd had a slightly more reserved round as he turned in one under before eight pars and a solitary birdie at the last saw him reach minus 10. The largely unheralded 28-year-old is looking for his first win on the PGA Tour since turning pro in 2007.
He will have a job on his hands though if he is to overcome major champion Oosthuizen, while there are four other major winners in among the chasing pack all hungry for a morale-boosting victory ahead of next month's U.S. Open at Pinehurst Golf Course in North Carolina.
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