Vancsik is chasing his first European Tour victory
SECOND ROUND LEADERBOARD:-10 D Vancsik (Arg)-9 C Cevaer (Fra)-8 L Santiago (Spa)-7 D Frost (SA)-6 N Begay (US), A Noren (Swe), M Vibe-Hastrup (Den)
Daniel Vancsik leads Christian Cevaer by one shot at the halfway stage of the Madeira Island Open.
The Argentine, who did not manage one top-10 finish in his first full season on the circuit last year, reached 10 under par by hitting a 66.
France's Cevaer was heading for a 64 until closing with a bogey five.
First-round leader Ricardo Santos fell back into the pack, while ex-Ryder Cup star Peter Baker could add only a 72 to his first-day 67.
In third place on eight under after a 67 is 44-year-old Spaniard Santiago Luna, playing the 520th event of his Tour career and his first of this year.
Experienced South African David Frost, like Baker playing on a sponsor's invitation, shot 65 and is just three back.
One further adrift is American Notah Begay, who came through Europe's qualifying school in November after losing his card in the States.
Former Open champion Paul Lawrie missed the cut on four over, but defending champion Jean Van de Velde improved eight shots on his opening 75 to make it through.