A shaky start to the last round by final pairing Joost Luiten and Shane Lowry blew the race for the ISPS Handa Wales Open wide open at The Celtic Manor Resort.
Dutchman Luiten, who was fifth in the defence of his KLM Open title on home soil last week, began the day with a two shot lead but three-putted the opening hole and also bogeyed the second on his way to a front nine of 38.
Surprisingly the 28 year old was able to hold onto a share of the lead until Scotland's Marc Warren carded his fourth birdie of the day on the 11th to move to 13 under par, one ahead of Luiten, France's Gregory Havret and Italy's Edoardo Molinari.
Ireland's Lowry, playing in the last group alongside Luiten, had gone to the turn in 37 to lie 11 under par, alongside Belgium's Nicolas Colsaerts and Italian Andrea Pavan.
Ryder Cup team-mates Thomas Björn and Lee Westwood had already completed their last competitive rounds before next week's contest at Gleneagles, Björn shooting a 74 to finish one over par and Westwood a 76 despite two birdies in the last three holes.
No sooner had Warren claimed the lead than he lost it, three-putting the 12th from six feet to run up a double-bogey six.
However, the Scot bounced straight back with a birdie on the 13th to make it a five-way tie for the lead with Colsaerts, Molinari, Havret and Luiten.
Luiten edged back in front when he two-putted the par five 11th from long range for his first birdie of the day, and his two-shot overnight cushion was back in place when he holed from six feet for birdie on the next.
Colsaerts had set the clubhouse target on 12 under par after a closing 67, but the former Ryder Cup player was annoyed not to have birdied the par five 18th, a hole he had eagled on the first two days.
Colsaerts was joined in the clubhouse lead by Ryder Cup debutant Jamie Donaldson, who birdied the last to complete a 67 and finish 12 under par.
And with Luiten dropping a shot on the 14th after pulling his drive into the water, that was just one off the lead on a crowded leaderboard.
England's Tommy Fleetwood had also moved to 12 under par after rebounding from a double-bogey on the 13th with a run of birdie-eagle-birdie-birdie, while compatriot Eddie Pepperell was on the same mark after birdies on the 15th and 16th.
Fleetwood two-putted the 18th for a closing birdie which meant he had played his last five holes in six under par, giving him a round of 67 and the clubhouse lead on 13 under par.
That meant Luiten, who had driven the short par four 15th to set up a birdie, held a one shot lead and needed to par the last three holes to claim victory.