Few would doubt Novak Djokovic’s position as one of, if not the, greatest male tennis player of all time.

The world No 1 has been untouchable at points throughout his career, with a record 24 Grand Slam titles to his name and over 400 weeks at the top of the ATP Rankings.

But while he has proved phenomenally difficult to test over the years, on a small handful of occasions players have been able to get the better of him.

And, though he did not lose all of those matches, on 12 occasions Djokovic has not been able to win even a single game in a set.

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We take a look at the 11 players to have achieved that incredibly rare feat, with only a certain Spaniard able to do it on multiple occasions.

Marat Safin – 2005 Australian Open

It has been almost two decades since a 17-year-old Djokovic made his Grand Slam debut at the Australian Open, an event he would later dominate.

But as with most young players, it took some time for him to find his feet at the top of the game, and he was handed a chastening defeat in his first major main draw match.

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Having come through qualifying, Djokovic was beaten 6-0, 6-2, 6-1 by Marat Safin on that day, with the fourth seed eventually going on to claim the title.

Djokovic has completely dominated his head-to-head against Monfils over the years, winning all 19 of his contests against the Frenchman.

Not all of those matches have been easy though, and their first-ever meeting saw the Serbian pushed to the brink.

Monfils did not drop a game in the fourth set to force a decider, but Djokovic ultimately recovered to battle his way to a 7-5, 4-6, 7-6(5), 0-6, 7-6 triumph.

Richard Gasquet – 2007 Estoril Open

Another Frenchman that Djokovic has rarely been troubled by is Gasquet, who has won just once in his 14 matches against the world No 1.

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Their second meeting came in the final in Estoril 17 years ago, and after losing the first set, Gasquet responded with an emphatic second set.

But it was not to be for him, Djokovic regaining control in a 7-6(7), 0-6, 6-1 victory.

Nikolay Davydenko – 2008 Tennis Masters Cup

Djokovic and former world No 3 Davydenko contested a thrilling round-robin clash at the Masters Cup – now known as the ATP Finals – 16 years ago.