Bradley Dredge and Stephen Dodd combined for a 27-under-par-189 total to earn the second win for Wales, and its first since this event fell under the umbrella of the World Golf Championships in 2000.
'Wales hasn't won it since 1987, so for Stephen and I to repeat what Ian Woosnam did and what David Llewellyn did is obviously huge for us and golf fans in Wales,' said Dredge, who will spilt $1.4 million with Dodd. 'It's fantastic.'
Rain started on Friday night and drenched the Victoria Clube de Golfe Course at Vilamoura. Saturday's play was contested under lift, clean and place, but the worst came Saturday night.
The rain never relented and the wind picked up overnight, so officials waited to start the final round. The weather never let up and with more of the same forecast for Monday, it was decided to shorten the tournament to 54 holes.
Dredge and Dodd combined for an 11-under-par 61 in Saturday's best ball competition to move two free of the field. A 30-foot eagle putt by Dredge on the 15th hole Saturday and a birdie by the team at 17 gave them a two-shot cushion.
England, which won the title last year, tied for second as Luke Donald, who hoisted the trophy with Paul Casey in 2004, and David Howell posted a 63 in the third round. Sweden, with Henrik Stenson and Niclas Fasth, also shot a 63 and joined England at 25-under-par 191.
The French tandem of Thomas Levet and Raphael Jacquelin also fired an 11-under 61 on Saturday and came in fourth at 22-under-par 194. Denmark's pair of Anders Hansen and Soren Hansen posted a 9-under 63 in round three and took fifth at minus-21.
Argentina, led by Angel Cabrera and Ricardo Gonzalez, established a new tournament record on Friday with an 11-under-par 61 in foursomes or alternate shot. Argentina shot a five-under 67 in Saturday's best ball and tied for sixth place with Maarten Lafeber and Robert-Jan Derksen of the Netherlands, which carded a 66. The two countries tied at 20-under-par 196.
Germany (64) came in eighth place at 19-under-par 197, followed by India (65), which finished at minus-18.
The American team of Stewart Cink and Zach Johnson tied for 17th at 14-under- par 202.