Novak Djokovic claimed a share of yet more history on Monday as he started his 377th week as world number one.

Djokovic has won 22 major titles, the joint-most among men, and has long since held the record for the most weeks at the top of the ATP rankings.

His nearest rival on the men's tour – since the rankings were introduced in 1973 – is the now retired Roger Federer, who spent 310 weeks in top spot.

But Djokovic has also matched Steffi Graf, the WTA leader, in making it to 377 weeks.

Graf was the women's number one 45 weeks longer than second-placed Martina Navratilova (332), with Serena Williams in third (319).

The WTA rankings began in 1975.