Vilamoura - English golfer Simon Khan carded a 6-under 66 to lead the Portugal Masters after the second round on Friday.
Khan raced out of the blocks at the Oceanico Victoria course in the Algarve with three birdies in the first four holes and also birdied the last two to reach 13-under 131 for the tournament.
"I started great, birdied the first two holes and that settled me down quickly," Khan said. "I think that you have to be positive around this course. If the wind gets up a little bit, it can be a little bit more testing."
The 39-year-old Englishman leads Rhys Davies of Wales, Felipe Aguilar of Chile and first-round leader James Kingston of South Africa by a shot going into the weekend.
The 219th-ranked Khan has twice won European Tour events but has had a fitful season so far, his best finish being a fifth place in France in July.
"It's not been a brilliant year overall, but I always feel good coming around this course and enjoy playing in Portugal," Khan said. "I think the thing is to enjoy the position I'm in and enjoy the pressure — hopefully I'm leading — and carry that on into the weekend."
Davies signed for a 67 including seven birdies and two bogeys to back up his opening-round 65, with Aguilar carding a 66 and Kingston shooting 68 to join the Welshman on 12 under.
Sweden's Christian Nilsson and England's David Dixon stormed up the leaderboard with 8-under rounds of 64 to finish 11 under.
Germany's Martin Kaymer, the top-ranked player in the tournament at No. 6, stayed in touch with a 68 to lie 9 under, four shots off the lead.
"Overall, I'm happy," Kaymer said. "You can shoot very, very low here, but it's about making the putts. If I can make more of those then I have a chance."
The halfway cut fell at 5 under, meaning last week's Madrid Masters winner Lee Slattery missed out by a shot, while European Ryder Cup captain Jose Maria Olazabal was two outside the mark.
American golfers Anthony Kang and two-time major winner John Daly also missed out.
131 - Simon Khan 65-66
132 - Felipe Aguilar (CHI) 66-66, James Kingston (RSA) 64-68, Rhys Davies 65-67
133 - Christian Nilsson (SWE) 69-64, David Dixon 69-64, Johan Edfors (SWE) 66-67
134 - Thomas Bjorn (DEN) 65-69, Keith Horne (RSA) 69-65, Tom Lewis 70-64, Rafael Cabrera Bello (ESP) 69-65
135 - Richard McEvoy 67-68, Martin Kaymer (GER) 67-68, Peter Lawrie 67-68, Oliver Fisher 69-66, Pablo Larrazabal (ESP) 67-68, Shane Lowry 69-66, Paul Lawrie 69-66, Fabrizio Zanotti (PAR) 68-67, Lorenzo Gagli (ITA) 69-66, Gregory Havret (FRA) 66-69
136 - Alvaro Velasco (ESP) 70-66, Thomas Aiken (RSA) 67-69, Steve Webster 66-70, Daniel Gaunt (AUS) 69-67, Ross Fisher 66-70, Gareth Maybin 65-71, Alvaro Quiros (ESP) 70-66, Peter Hanson (SWE) 66-70, David Drysdale 69-67, Pedro Figueiredo (POR) 71-65, Tano Goya (ARG) 67-69, Mark Foster 67-69
137 - Francesco Molinari (ITA) 67-70
138 - Thongchai Jaidee (THA) 66-72, Marcus Fraser (AUS) 69-69, Padraig Harrington 67-71
139 - Hennie Otto (RSA) 72-67, Colin Montgomerie 67-72, George Coetzee (RSA) 70-69, Richard Green (AUS) 71-68
Missed the cut
140 - Andrew Dodt (AUS) 67-73, Mark Brown (NZL) 68-72, Miguel Angel Jimenez (ESP) 69-71
141 - Jose-Maria Olazabal (ESP) 71-70
142 - Scott Strange (AUS) 70-72
145 - Brett Rumford (AUS) 76-69, Anthony Kang (USA) 71-74, Matthew Zions (AUS) 71-74
146 - Paul McGinley 74-72
147 - John Daly (USA) 73-74