Sweden's Adam Mednick took over the lead in the Credit Suisse Private Banking Open in Switzerland after returning a second successive 65. He leads on 12-under-par 130, by two from Welshman Stephen Dodd, another to shoot 65, and Spain's Alvaro Salto, who added a 68 to his opening 64.
On another day of low scoring under ever-threatening storm clouds, five players went round in 65 while the cut came at two-under-par 140.
Mednick, whose bogey-free 65 contained six birdies, felt he could have done even better. "I missed at least four more close birdie chances so it could have been really low," he said.
Mednick, now 33, spent a year on the US Tour in 1997, also shot 65 in the pro-am so a continuation of this form would leave the rest of the field with a chase on their hands.
Dodd also made a case for the over-30s with his 65, which also contained six birdies. "I just hit it straight and holed some nice putts," said the man from Barry. "That is always the key to a good round and I feel comfortable on the greens. I had just 27 putts."
Salto was equally pleased with his efforts, while local hero, Dimitri Bieri, carded a 67 for 133 to share fourth place with overnight leader Michele Reale of Italy who returned 70.
One shot further back is Mattias Nilsson of Sweden, who carded a 66 and is joined on 134 by England's Sam Little (67) and another Swede, Tony Edlund (68).
The other 65s were recorded by England's Matthew Blackey, who is nine under par for his last 23 holes after being three over for the opening 13, and Raimo Sjoberg of Sweden, who bounced back after an opening 74 to make the cut on 139.
Another survivor was 1999 Amateur champion Graeme Storm, who failed to find a birdie in a 72 but is also on 139, while Scotland's Graham Rankin made the first cut of his Challenge Tour career with a 68 to finish on the 140 limit.
Another Swede, Peter Gustafsson, holed-in-one with an eight-iron at the 134m seventh hole but he lost out on two counts. The hole-in-one prize of a gold ingot worth £6,000, was on offer at the 10th, while his 71 failed to save him from the cut on 142.