Jamieson and Lynn in contention
Scott Jamieson and David Lynn claimed a share of the lead midway through the final round of the Portugal Masters in Vilamoura on Sunday.
England's Paul Waring had started the day with a two-shot lead but saw that wiped out almost immediately when he bogeyed the first and Jamieson birdied the second.
On a crowded leaderboard, seven players briefly shared the lead on 15 under until Jamieson - who came agonisingly close to the first ever 59 on the European Tour on Saturday - birdied the par-five fifth from eight feet.
A run of pars then took the Scot to the turn in 33 and allowed Lynn, playing several groups ahead, to join Jamieson in the lead on 16 under after a superb approach to the 14th left him with a tap-in birdie.
Lynn was producing the round of the day in breezy conditions and moved into the outright lead with another birdie - his eighth - on the short par-four 15th.
Jamieson looked like falling two behind when he missed the 10th green and hit a clumsy chip, but saw his long-range par putt just catch the edge of the hole and drop in.
He remained at 16 under and was joined in second by Spain's Pablo Larrazabal, who had carded his fourth birdie of the day on the 11th.
Lynn, whose only previous European Tour title from almost 400 events came in the KLM Open in 2004, moved two shots ahead with a birdie on the 17th, his third shot to the par five finishing just inches from the hole.
Lynn's heart will have been in his mouth as his approach to the 18th looked set to find the water short of the green, but it carried the hazard by a matter of feet and two putts later he completed a superb 63.
That set the clubhouse target at 18 under par, but Austria's Bernd Wiesberger had moved to 17 under with his third birdie in succession on the 16th, with Waring, Jamieson, Larrazabal and South African Justin Walters all on 16 under.
Jamie Donaldson had looked certain to move 17 under after a brilliant approach to the 13th, but somehow three-putted from three feet to drop back to 15 under.
Wiesberger's chances effectively disappeared when he found the water with his second shot on the 17th, but playing partner Walters made a birdie and then holed from 40ft from across the 18th green for a most unlikely par.
At 17 under Walter was alone in second and after starting the week 126th on the Race to Dubai, looked certain to have done enough to climb inside the top 110 and keep his card for next season.