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.
16 de enero 2018
|Lambert ´never thought´ he would return to Premier League|
|Wenger ´very aggressive´ towards referee Dean, says FA report|
|Reported Arsenal target Malcom starts for Bordeaux vs Caen|
|Valverde not making big deal of Dembele´s latest Barca blow|
|Costly day for Kohli as Proteas close in on series win|
|Date set for Afghanistan´s maiden Test|
|Returning McIlroy ready to end winless run|
|In-form Short leaves coach Kirsten needing dental treatment|
|Arsenal will have a ´hard time´ signing Malcom|
|Ronaldo and Madrid nominated for Laureus awards|
|Nantes´ Diego Carlos brands Chapron clash ´historic´|
|This is not important - Conte unconcerned if substitutions upset Hazard|
|Conte ´doesn´t think´ Chelsea have pursued Sanchez|
|Cobblestone climb part of 2019 Tour de France Grand Depart|
|Emery hints at Neymar return against Dijon|
|Joshua labels Parker claims ´fake news´|
|´Emotional´ Fleetwood honoured by Seve Ballesteros Award|
|Tears for Kvitova as Bouchard sets up Halep meeting|
|Mkhitaryan key to United-Sanchez deal, claims Raiola|
|WATCH: Sabalenka wins point using racquet throat|
|Federer, Djokovic and Zverev among Australian Open first-round winners|
|Kubica gets reserve role as Williams hire Sirotkin|
|Shambolic Stars out after Sixers thrashing|
|Wales pick uncapped Worcester wing Adams in Six Nations squad|
|Tevez: CSL spell was a holiday|
|Mignolet considering Liverpool future|
|Laidlaw among several returning stars in Scotland Six Nations squad|
|´Fairy tale´ 2017 motivation for Federer|
|Fred waiting for Guardiola call amid Man City speculation|
|Dominant Federer makes light work of Bedene|
|Halep faces nervous wait over ankle injury|
|Inter confident but patient over Rafinha|
|Kohli fined after umpire outburst|
|Djokovic hits back at Australian Open boycott suggestions|
|De Grandhomme lifts Black Caps to win in Taylor´s 200th ODI|
|Giggs had counselling after Old Trafford exit|
|Durant continues dominance over Cavs as Warriors win|
|Halep survives scare and rolled ankle at Melbourne Park|
|Westbrook ejected against Kings after arguing call|
|Djokovic eases past Young on return|
|Sharapova staying grounded after Melbourne win|
|Neville: Mourinho would happily swap Mkhitaryan for Sanchez|
|Raonic suffers surprise loss in Melbourne|
|Sharapova wins on return to Australian Open|
|Pirates send McCutchen to Giants|
|Man United becoming Pogba´s team – Mourinho|
|Saints, Steelers coaching staffs to lead Pro Bowl teams|
|LeBron says we cannot let racism ´conquer us as people´|
|Super Bowl hopeful Belichick cautiously preparing for Jaguars|
|Cardinals veteran Yadier Molina: Three more years before retirement|
|The best finishes in NFL playoff history - Where does Keenum & Diggs´ Minneapolis miracle rank?|
|Can ´talking with everyone´ but hints at Liverpool stay|
15 de enero 2018
|Mourinho ´not unconfident´ Manchester United will sign Sanchez|
|Pogba warns City that United will not give up the chase|
|Assist king Pogba matches De Bruyne, Sane despite injury and suspension|
|Manchester United 3 Stoke City 0: Valencia, Martial and Lukaku trim gap at the top|
|Shaw feeling on top of his game amid United run|
|Ulster and Ireland wing Bowe to retire|
|Mkhitaryan left out by Manchester United amid Arsenal talk|
|Inter secure Lopez on loan from Benfica|
|Hurst marvels at hat-trick maestro Kane|
|WATCH: Neymar nutmegging for fun in PSG training|
|Best eager to sort out Ireland future|
|Bastareaud and Haskell to learn fate on Wednesday|
|Nantes´ Carlos has red card overturned after being kicked by referee|
|De Villiers leads Proteas´ recovery following imperious Kohli century|
|´Logical´ for Aubameyang to stay at Dortmund, says Stoger|
|Di Resta out of Williams running|
|Stokes ´keen´ for court appearance after affray charge|
|Titans part ways with Mularkey|