Andy Murray crashes out of Australian Open to inspired Mischa Zverev

Top seed loses 7-5, 5-7, 6-2, 6-4 to 50th-ranked GermanZverev to face Roger Federer or Stan Wawrinka in quarter-finalAndy Murray, out of sorts and scrapping like a junkyard dog for three-and-a-half hours over four sets, could not hold off the magnificent challenge of Mischa Zverev, the world No50, and went out of the Australian Open on day seven, when he surely harboured hopes of cashing in on the earlier departure of Novak Djokovic.The last time the top two seeds failed to reach the quarter-fin