Imperious Murray marches on in Vienna, Zverev stuns Wawrinka

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Andy Murray continued his march towards yet another title by outclassing John Isner to reach the Vienna Open semi-finals and qualifier Mischa Zverev stunned Stan Wawrinka in the last eight of the Swiss Indoors Basel.

Top seed Murray extended his winning run to 13 matches and made it seven victories out of seven against Isner by ousting the big-serving American 6-1 6-3 on Friday.

The Wimbledon champion, still in with a chance of replacing Novak Djokovic at the top of the rankings this year, made just 10 unforced errors in another dominant performance.

Murray prowled around the court as he tormented Isner, who had his right hand strapped up early in the second set, and stayed on course for a seventh ATP World Tour title of a magnificent year.

The Brit sealed yet another victory in style with a delightful sliced backhand and will now face David Ferrer in the last four.

Defending champion Ferrer saved a match point before going on to see off the unseeded Viktor Troicki 6-3 3-6 7-5.

Ivo Karlovic also saved a match point as he fought back to beat wildcard Karen Khachanov 6-7 (5-7) 7-6 (7-5) 6-3 and will take on 2011 champion Jo-Wilfried Tsonga, who sent Albert Ramos-Vinolas packing in straight sets.

World number 72 Zverev pulled off an astonishing victory to reach the semi-finals in Basel, beating US Open champion Wawrinka 6-2 5-7 6-1.

Top seed Wawrinka was broken six times as Zverev became the first qualifier to reach the last four of the semi-finals since Marcos Baghdatis 11 years ago.

Zverev will face fourth seed Marin Cilic, who can put himself in pole position to qualify for the ATP World Tour Finals by beating the German outsider after downing Marcel Granollers 6-3 6-3.

Kei Nishikori, seeded three, claimed his first win over Juan Martin Del Potro to ensure he will take on Gilles Muller, conqueror of Federico Delbonis, in the other semi-final.