Carlos Alcaraz has been knocked out of the Australian Open quarter-finals at the hands of Alexander Zverev after threatening an incredible comeback. Alcaraz has been fighting at the top of men’s tennis ever since his breakthrough win at the US Open in 2022. He had been on a run of reaching at least the semi-finals of a Grand Slam in his last four major entries. There was a chance for Alcaraz to get revenge on Novak Djokovic from his loss at the ATP Finals at the end of last year with both players on track to reach another major final. But Alcaraz’s run has now ended emphatically with Zverev do…