Edberg

"You can never count him out if everything goes right," six-time Grand Slam champion Stefan Edberg told BBC Sport.

But Grand Slam titles have regularly been won by great players in their mid-thirties over the past decade, and Edberg has played his part.

������ is clear when speaking to Edberg is how the top players now feel no psychological barrier to winning in their thirties.

Edberg retired in December 1996 aged 30, after yet another appearance in a Davis Cup final.

Djokovic said in November he asked Murray to work with him "because I still have big plans", and Edberg believes the Scot offers a deep knowledge of opponents, inspiration and motivation.