Novak Djokovic targets a record-equalling 20th major and sixth Wimbledon title from Monday which will edge him tantalisingly closer to becoming only the third man in history to complete a calendar Grand Slam.

The World No. 1 has already won a ninth Australian Open and second French Open this season. That has put him halfway to emulating Don Budge (1937) and Rod Laver (1962 and 1969) in sweeping all four majors in the same year. It is a feat even his closest rivals Roger Federer and Rafael Nadal have never managed.