Matt Wallace carried on where he left off as he raced five shots clear at the Portugal Open before darkness curtailed his second round.
The Englishman carded a bogey-free 63 on Thursday and gained another six shots through 14 holes a day later, with Sebastian Heisele his closest challenger.
Wallace's card for the tournament remains without a bogey, highlighting how well he has dealt with the adverse weather at Morgado Golf Resort.
He told the European Tour website: "It was definitely more of the same, but actually, I probably played better.
"I had to deal with the pressure and also the difference in the condition of the course because we teed off at 4.55pm. I've never done that before. I think I dealt with everything really well.
"I'm really happy with my performance. I holed a lovely putt on the last [14th] there to keep the momentum going, so I'm really pleased."
27 holes played-- The European Tour (@EuropeanTour) May 12, 2017
14 birdies made
5 shot lead pic.twitter.com/L785IIXxdz
Germany's Heisele managed to complete 12 holes and moved to 11 under overall.
Wallace's compatriot Charlie Ford briefly stole the spotlight with an ace at the 11th, while local favourite Jose-Filipe Lima's 71 earned him a share of seventh.