The Djoker has become a choker

LONDON - Twelve months ago, Novak Djokovic arrived at Wimbledon with the world at his feet, but the fun-loving Serb known as 'The Djoker' is returning to the All England Club with his career in crisis after an astonishing fall from grace.

Having finally succeeded in his quest to win the French Open last year, Djokovic appeared poised to join the tennis immortals.

He was the first man since Rod Laver in 1969 to hold all four Grand Slam titles at the same time and had won Wimbledon in 2014 and 2015, adding to his 2011 triumph.