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Gonzalez's fierce forehands and big serves ate away at Murray's resolve and he took the opener with a single break.

The Scot rallied and fought off eight break points before carving out a break of his own, as Gonzalez wobbled, to tie the match one-set all.

But Gonzalez broke a fading Murray twice in the decider to seal victory.

I'm happy with the two wins I had here but not with the way I played Andy Murray

The Chilean will now meet fifth seed Dominik Hrbaty in the semi-finals after he beat Belgian Kristof Vliegen 6-7 6-1 6-3.

"I'm a bit disappointed because I thought I was serving as well as I did in the other matches," said Murray.

"I'm happy with the two wins I had here but not with the way I played. I'm not doing so well in the rallies.

"But I suppose it's a good sign when you're beating top 50 players without playing your best tennis."

Murray got down to business at St Jakobshalle, winning 11 straight points on his serve.

But the world number 17 jolted the Scot out of his comfort zone with his powerful returns and seized on a short second serve to break in the seventh game.

Murray could find no way past the Wimbledon quarter-finalist as he swiftly served out for the set in 31 minutes.

The 18-year-old staved off four break-points in the opening game of the second set as Gonzalez battered him with his attacking groundstrokes.

The more experienced Gonzalez proved too powerful for Murray

Murray held off four more in a brilliant third game which saw both players display quick hands and legs as they chased around court.

The Scot's determination must have rattled Gonzalez as a series of unforced errors saw him surrender his serve at 4-2.

Murray coolly served out to love to level the match in just over an hour and set up a thrilling decider.

But Gonzalez grabbed control of the third set, breaking Murray at the first time of asking with some powerful groundstrokes, and raced to a 3-0 lead.

Murray showed me that he really should try and come up the net to finish points off quickly From Dan Have your say on Five Live

Murray visibly faded and was broken again as Gonzalez's power and experience proved too much.

Second seed David Nalbandian reached the semi-finals after a 6-2 6-2 win over Thailand's Paradorn Srichaphan.

The Argentine player needed just 58 minutes to wrap up the win and have a chance of reaching his fourth successive Swiss Indoors final.

He will face Cypriot qualifier Marcos Baghdatis in the semi-final.

The world number 85 reached his first ATP semi-final with a 6-7 7-6 6-3 win over Argentina's Jose Acasuso.