NEW DELHI: Novak Djokovic's quest for a record-breaking 25th Grand Slam title ended prematurely as he retired injured during his Australian Open semi-final against Alexander Zverev on Friday.
The 37-year-old Serbian star, who had his upper left leg heavily taped following an injury in the quarter-finals, called it quits after losing a grueling first set 7-6 (7/5).