A searing backhand return down the line sealed the deal, booking a fourth quarter-final at Melbourne Park for the no-frills 31-year-old. So most important is to win, to still be in the tournament.' Showcasing the composure that has helped Wawrinka win all three of his grand slam finals, the Swiss lifted a gear in each of the three tie-breaks and his fearsome backhand was on fire as he closed out the match with a 53rd winner. 'I know that my level is there, that physically I'm feeling good. 'Again, I'm not really worried about trying to improve every match, trying to play better or not. 'Yeah, I think this match was the best match of the tournament so far, that's for sure,' Wawrinka told reporters. So he was thrilled to escape in three sets over Italian Seppi, having fought back from a break down to take the last into another tiebreak.

Three-times grand slam champion Wawrinka has done it tough in the first week, surviving a five-set marathon in the first round and another four-set grind to reach the fourth round.

The hard-working Swiss faces a tough match against former finalist Jo-Wilfried Tsonga for a place in the semi-finals where Murray can no longer be an opponent after the Briton's stunning upset by world number 50 Mischa Zverev earlier on Sunday. Fourth seed Wawrinka now finds himself the highest ranked player in the top half of the draw and with the credentials to go all the way to emulate his 2014 championship. By Ian Ransom MELBOURNE (Reuters) - Stan Wawrinka's hopes of a second Australian Open title were delivered a huge boost on Sunday as he fended off Andreas Seppi 7-6(2) 7-6(4) 7-6(4) to reach the quarter-finals only minutes after top seed Andy Murray crashed out of the tournament.

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