Novak Djokovic tames his temper to beat Alexander Zverev in Australian Open quarter-final

Two-time defending champion Novak Djokovic has overcome several moments of frustration to win a tense Australian Open quarter-final against Alexander Zverev in four sets on Rod Laver Arena.

Djokovic smashed a racquet at one stage but managed to control his temper on his way to completing a 6-7 (6/8), 6-2, 6-4, 7-6 (8/6) triumph over the sixth-seeded Zverev in a match that finished well beyond midnight at Melbourne Park.

The world number one, who had struggled with an abdominal injury in his previous two matches, will play Russian qualifier Aslan Karatsev in the semi-finals.

Karatsev became the first male qualifier in the Open era to reach the last four at a major following his 2-6, 6-4, 6-1, 6-2 win over an injury-hit Grigor Dimitrov…