The Serbian world primary hit again strongly after shedding a good opening set on a tiebreak however trailed in each the third and fourth units earlier than turning them round.
Germany’s Zverev will rue permitting Djokovic again from 4-1 down within the third set and he was additionally up 3-0 within the fourth.
Djokovic once more wore tape on his stomach space, a legacy of the damage picked up in his third-round win over Taylor Fritz. But it surely didn’t seem to trouble him as he reached his thirty ninth Grand Slam semi-final, the place he’ll face an unlikely opponent in Russian qualifier Aslan Karatsev.
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The 23-year-old Zverev started in assured style and secured the primary break of the match however didn’t convert a set level on Djokovic’s serve when main 5-3.
He wavered on his personal serve at 5-4 although, and Djokovic took the set right into a tiebreak, just for some uncharacteristic errors to permit Zverev to sneak a 59-minute set.
Djokovic wanted solely 29 minutes to win the second set however his stage dropped initially of the third, and he destroyed a racket in anger as he slipped 4-1 behind.
Zverev was 0-30 forward on Djokovic’s serve within the subsequent sport however Djokovic discovered one other gear, profitable 20 of the subsequent 24 factors to maneuver one set from victory.
One other momentum shift noticed Zverev take a 3-0 lead within the fourth set and have three factors to maneuver 4-0 forward, however Djokovic dug in to haul himself again into competition.
Zverev threatened to take the match right into a decider however Djokovic saved a set level at 5-6 with an ace and a strong first serve introduced up match level within the day’s second tiebreak.
Djokovic netted a backhand however compelled a volley error from Zverev to earn one other probability, this time on his personal serve, and he wrapped up the match along with his twenty third ace.