Keegan Bradley will take a one shot lead into the final round of the HP Byron Nelson Championship after shooting a two under par 68 in Texas on Saturday.
Bradley has been at the top of the leaderboard from the outset following a stunning first round of 60 on Thursday.
However, Sunday promises to be a fascinating final day with South Korea's Bae Sang-moon making real inroads into Bradley's advantage with a 66 and Tom Gillis a further shot adrift after a 67.
Bradley had a mixed day on Saturday with five birdies accompanied by three dropped shots, the last of which was his third bogey of the week at the final par four 18th - something he may regret given Bae's efforts.
Five birdies and one bogey saw him finish with a third consecutive round of 66 and closing in on Bradley's 13 under mark.
Gillis carded four birdies and a bogey for a 67 with Scott Piercy's 66 - including six birdies - seeing him end the day in fourth.
South Africa's 2011 Masters Tournament champion Charl Schwartzel (69) was among a four-way tie for fifth on eight under alongside American trio Gary Woodland (68), Harris English (68) and John Huh (69).