London, July 5 -- Serbian tennis icon Novak Djokovic continued his remarkable habit of rewriting the tennis record books, adding another milestone to his illustrious career at Wimbledon on Sunday.

Although the 39-year-old was not at his clinical best, the seven-time Wimbledon champion dug deep to overcome spirited qualifier Roman Safiullin 7-6(6), 6-3, 3-6, 6-3 on Centre Court, securing his place in a ninth successive Wimbledon quarter-final and the 17th quarter-final appearance of his career at the All England Club.

The victory also marked Djokovic's 106th singles win at Wimbledon, taking him past Roger Federer for the most men's singles victories in the tournament's history. Only Martina Navratilova, with 120 singles wins, has recorde...