Matt Wallace produced a dazzling first round that included 10 birdies to hit the front at a stormy Portugal Open.
The Englishman was in formidable form in Portimao on Thursday, but his 10-under 63 only proved enough for a one-shot lead over Sebastian Heisele.
In just his ninth round on the European Tour, Wallace became the sixth player this season to card 10 birdies - five of which came in succession from 12 to 16 - and the first to do so without dropping a shot.
"It was a fantastic round really. It wasn't looking great at the start when the rain came in 10 minutes before my tee time. Then it stopped just as we got on to the tee, so that was kind of a good omen," said Wallace.
"Everything was working well to be honest. Everything clicked. I made two good par saves on the front nine to keep the momentum going. After that every hole was at least a birdie chance, so it was a really good day."
Heisele eagled the par-five seventh and did brilliantly to stay close to Wallace, but dropped shots at six and 11 to sit second on the leaderboard.
Julian Suri, Paul Maddy and Jamie Rutherford all produced bogey-free rounds to take a share of third, four shots adrift of the summit.
Play was suspended in the afternoon due to the threat of lightning, with Jeff Winther, Robert Dinwiddie and Damien Perrier two under through three holes.
They will resume their rounds on Friday morning, along with a handful of players who were unable to take to the tee.