Novak Djokovic reached the Wimbledon quarter-finals for the 16th time but it proved a hard day's work at his Centre Court office as he ground past Australian Alex De Minaur on Monday.The 38-year-old started abysmally and lost the opening set in 31 minutes but eventually gained control of a cagey battle to win 1-6 6-4 6-4 6-4 to keep alive his quest for an unprecedented 25th Grand Slam title.

Djokovic came under serious pressure for the first time at this Wimbledon Championships before solving the riddle to triumph 1-6, 6-4, 6-4, 6-4 and book his place in the quarter-finals

Novak Djokovic overcame an uncharacteristically unsteady start, coming through for a 1-6, 6-4, 6-4, 6-4 victory over 11th-seeded Alex de Minaur in the fourth round of Wimbledon on Monday.