Eddie Pepperell and Jens Dantrop have both recorded rounds of 66 to lead after day one of the Nordea Masters in Malmo.
The Englishman and the Swede are languishing in 346th and 385th respectively in the world golf rankings, but both impressed during Thursday's play in Scandinavia.
A group of five players, including Gareth Maybin and Stephen Gallacher, are one shot behind on five-under-par, while six players are a further shot adrift on a closely-packed leaderboard.
World number two Henrik Stenson, who is competing in his home tournament, ended the day on three-under-par after a mixed display that included four bogeys.