Tennis fans have called for Andy Murray to retire after he was sent crashing out of the Australian Open by Tomas Martin Etcheverry on Monday morning. The Briton had gone into the tournament hoping to show he’s still got what it takes to play at the highest level. Yet Murray struggled and looked a shadow of his old self Down Under as his opponent reigned supreme. Etcheverry won 6-4, 6-2, 6-2 in just two hours and 23 minutes to book his place in the second round of the competition. And tennis fans on X have now expressed a belief that Murray should quit the sport. “Yeah Andy Murray, it’s time to…