Scott Hend carded a superb 63 to surge into the lead of the European Masters at the halfway stage, while Darren Fichardt matched his score for the round to sit one stroke adrift.
The Australian suffered heartbreak as he lost in a play-off with Alex Noren in Crans Montana last year, but he is brilliantly placed to make up for that disappointment this time around.
Hend held a share of the overnight lead with Miguel Angel Jimenez and Tyrrell Hatton but, while he went from strength to strength, Jimenez and Hatton both faltered.
Jimenez dropped back to three-under-par with a three-over 73, while a 71 for Hatton saw him fall to five under.
Hend, though, gained seven strokes in a flawless round to lead Fichardt - who also carded a 63 - by one stroke.
A magnificent tee shot to three feet helped Hend to an eagle at the seventh, before he made the turn in 32 after a birdie at the ninth. He then finished in spectacular fashion with four birdies in the final five holes.
Hend's performance came despite the significant distraction of having his children home in Florida, where Hurricane Irma is set to land.
The 44-year-old, whose wife is serving as his caddie in Switzerland, said: "We're a bit worried about the kids in Florida with the sitter at the moment.
"We've been up late at night trying to find out contingency plans. I think they're going to get out of there. It's not worth the risk."
Fichardt matched Hend's round with five birdies and an eagle, which came at the 15th, as the South African followed up his opening round 65 in style.
Thongchai Jaidee, Fabrizio Zanotti and Todd Sinnott are all four strokes back on nine under, with Matthew Fitzpatrick five off the pace along with Julian Suri and Ryan Fox.
Defending champion Noren improved on his level-par round one with a three-under 67 but still has plenty of ground to make up to have any hope of retaining the title.
Lee Westwood, making his 500th European Tour appearance, made the cut thanks to three birdies in the final five holes having been one over after 12.
World number 16 Tommy Fleetwood did not make the cut, however, his level-par round not enough, the Englishman having carded a 72 a day earlier.
25. November 2017
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|Inspirational Smith hits century to thwart England|
|Guardiola more ´logical´ for Man United than Mourinho – Cantona|
|England unconcerned over Anderson after scare|
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|England on top as wickets fall in Brisbane|
|Maxwell scores 278 in Ashes reminder|
|Falcons RB Freeman ruled out with concussion|
|Klopp quashes Conte´s recovery complaints|
|Hoeness believes in Bayern´s ´new spirit´|
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|Mourinho slams Mkhitaryan for disappearing during Manchester United games|
|Newcastle beaten by Gloucester in Premiership|
24. November 2017
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|Ulster leave it late to deny Treviso second away victory|
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|Conte calls for clarity from Chelsea on Courtois deal|
|West Ham 1 Leicester City 1: Kouyate gets Moyes up and running|
|Robinson tips Farrell for World Rugby Player of the Year|
|Manchester United midfielder Carrick undergoes heart procedure|
|Manchester City youngster Bytyqi retires with heart condition|
|England can thrive on hostile atmosphere - O´Loughlin|
|Salah could become the Premier League´s greatest African star - Lauren|
|Lauren reserves judgement on Man City´s invincible credentials|
|Goffin and Tsonga cancel each other out on opening day of Davis Cup final|
|Stafford admits ankle is ´not 100 percent´ after Lions´ loss to Vikings|
|Bayern boss Heynckes slams ´insanity´ of Champions League ticket prices|
|Messi hails Barcelona team-mates after European Golden Shoe triumph|
|Napoli´s Hamsik saves space for a Serie A title-winning tattoo|
|Jardim urges quick Monaco response to Champions League woe|
|You always have a chance - Wagner hopeful of Man City scalp|
|Chelsea´s tough title defence was to be expected - Klopp|
|Horne replaces Dunbar in Scotland XV|
|Neymar and Cavani bound by common goal at PSG|
|Simeone: Everything seems better when Atletico win|
|F1 Raceweek: Scores to be settled in Abu Dhabi|
|Injuries not to blame for Real Madrid LaLiga position - Zidane|
|Icardi could stay at Inter forever, says Spalletti|
|Former England star Owen finishes second on horse racing debut|
|Emery backs Mbappe to shine on Monaco return|
|Robben-less Heynckes handed timely Coman boost|
|Guardiola not complacent ahead of Huddersfield clash|
|Trump to ´quickly´ play golf with Woods and Johnson|
|Salah not Liverpool´s only threat, insists Conte|
|Klopp trusts Moreno ´100 per cent´ despite Sevilla shocker|
|No excuses for Conte despite Chelsea´s travel trouble|
|Salah has nothing to prove in Chelsea reunion, says Klopp|
|We´re on the Ball - Paceman Jake says England´s homework is paying off|
|Bale return could be imminent - Zidane|
|Megson´s interim role is no audition as he awaits permanent West Brom boss|
|Bosz has derby focus despite Dortmund criticism|
|Kaka predicts bright future for Milan´s Silva|
|Lyon not sorry for controversial pre-Ashes comments|
|Ashwin takes four as India skittle out Sri Lanka|
|Messi equals Ronaldo with fourth European Golden Shoe|
|Mourinho fears Fellaini exit amid Arsenal, PSG links|
|I don´t know what you want - Mourinho blasts Man United critics|
|Mourinho protecting Pogba and Ibrahimovic as they prepare for Brighton|
|Stoke to offer Crouch fresh deal|
|Record-breaker Holmes hits Fiji for six as Australia march into final|
|Del Piero expects Juventus and Dybala to rediscover top form|
|Melbourne City 1 Perth Glory 3: Ten-man hosts pay the penalty|
|Chawrasia´s challenge on track in Hong Kong|
|Herbert leads Australian Open with Day poised|
|Moyes wants greater ref protection for Carroll|
|Unsworth questions players´ commitment after Atalanta embarrassment|
|Pistorius prison sentence more than doubled|
|Who, what, when and where? – All you need to know about the 2018 World Cup draw|