McDowell ended the dream run of Shane Lowry, who had beaten his fellow Northern Irishman McIlroy.
Young midfielder Tommy Oar was dropped along with Shane Lowry, James Holland and goalkeeper Eugene Galekovic.
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He withdrew to spend time with his family, and will be replaced by 65th-ranked Irishman Shane Lowry.
But Aston Villa defender Shane Lowry was omitted, along with Netherlands-based midfielders Tommy Oar and James Holland.
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Shane Lowry (71) is four under and Colm Moriarty (72) one over while Louis Oosthuizen led on 15 under.
Irish Open champion Shane Lowry returned a 74 and Spaniard Pablo Martin, winner of the Portuguese Open two years ago, a 72.
Jamieson's compatriot Lawrie, the 1999 British Open winner, was tied for seventh on 209 with Ireland's Shane Lowry and Englishman Danny Willett after all carded 70.
In claiming victory, Huldahl became the third shock winner on the European Tour in just four weeks following Irish amateur Shane Lowry and world number 449 Christian Cevaer.
South Africa's 2010 British Open champion Louis Oosthuizen made 67 to be tied for seventh on 139 along with Italy's Francesco Molinari (68), Irishman Shane Lowry (70) and Spain's Pablo Larrazabal (68).
Spain's Sergio Garcia showed some signs of a return to form with a 70 to also finish four under alongside Ireland's Shane Lowry, Swede Robert Karlsson, South Korean amateur Jin Jeong and American JB Holmes.
England's Danny Willett, Scot Paul Lawrie, Irishman Shane Lowry, Frenchman Julien Quesne, Indian Jeev Milkha Singh and Dane Thomas Bjorn are all in the group with current Open champion Ernie Els a shot further back.
Watney, who was runner-up at the WGC-CA Championship event in March, could have led by even more, but bogeyed his final hole after three-putting to have a two-shot buffer over Germany's Martin Kaymer and Irishman Shane Lowry.
Elsewhere, the draw for the first World Golf Championships tournament of the year, the Accenture Match Play, has been made, pairing world No. 1 Rory McIlroy, who lost to Hunter Mahan in the final last year, against Irishman Shane Lowry.
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Dredge joined Irishman Shane Lowry, Gareth Maybin of Northern Ireland, Dane Thomas Bjorn, Spaniards Jose Manuel Lara and Ignacio Garrido, Tano Goya of Argentina and Scots Andrew Coltart and Montgomerie, theEuropean Ryder Cup captain, in qualifying outright at international final qualifying.
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