Novak Djokovic won a seventh Wimbledon title and 21st Grand Slam crown on Sunday with a four-set triumph over Nick Kyrgios, whose challenge angrily unravelled after a blistering start. Top seed Djokovic won 4-6, 6-3, 6-4, 7-6 (7/3) to equal Pete Sampras’s mark of seven titles at the All England Club and move within one of the men’s record of eight held by Roger Federer.