Defending champion Novak Djokovic survived a rocky third set to defeat American qualifier Denis Kudla to reach the last 16 at Wimbledon for the 13th time on Friday.

The world number one triumphed over 114-ranked Kudla 6-4, 6-3, 7-6 (9/7) to book a place in the fourth round of a Grand Slam for the 55th time. Djokovic, chasing a record-equalling 20th major, cruised through the first two sets but then had to fight back from 1-4 down and also 1/4 in the tiebreaker before he recorded a 75th win at the All England Club.