Local favourite Vitor Lopes has shot a seven-under-par 65 to top the leaderboard after day one of the Open de Portugal in Vau.
The 24-year-old, who predominantly plies his trade on the third-tier Alps Tour, took advantage of a field missing those competing in the US Open with an eagle, six birdies and a single dropped shot.
At seven under Lopes, whose biggest win on the European Tour's feeder Challenge Tour was a cheque for $A3,000 in Denmark last year, led by two from France's Damien Perrier and Spain's Carlos Pigem.
Another local hope, Ricardo Santos, carded a 68 at Royal Obidos to share fourth with South African Garrick Higgo, German Alexander Knappe and American Julian Suri.
Last week's winner George Coetzee – the only member of the world's top 100 competing – opened with a three-under 69 to sit alongside leading British contenders David Boote, Nathan Kimsey, Gary King and Andrew Wilson.
Queenslander Maverick Antcliff was five shots off the pace with a two-under-par 70, while Wade Ormsby is struggling to make the cut after finishing six-over.