THE middle of May is, admittedly, a somewhat premature time to be making predictions about what is going to transpire during the rest of 2015 but restraint has never been my strong point so, here goes: Novak Djokovic will complete a calendar-year grand slam.

It may not seem outrageous to suggest the World No.1 will dominate men's tennis this season but domination and winning all four majors in the same year are two very different things. When you consider no player has achieved the feat since Rod Laver did the clean sweep in 1969, it illustrates just how hard it is.

Neither Roger Federer nor Rafael Nadal has even been close. Neither has managed to begin the year by winning the Australian Open in January and then follow it up with the French Open title in June. Indeed, not since Jim Courier in 1992 has anyone won the first two legs of the calendar grand slam.

Djokovic may only be a quarter of the way there after winning the Australian Open for the fifth time at the start of the 2015 but his form since then has been imperious; he has lost only once, to Federer in the Dubai final in February.

It has been the manner of the 28 year-old's wins that has been so striking though; he has demolished opponents when playing his best and has also ground out victories when his level has been slightly below par. And that is exactly what is needed to win a calendar grand slam - the ability to win ugly. No player will play well in every match of every grand slam but not losing on those days is what sets up the opportunity to make history.

The next fortnight is, perhaps, the most important two weeks of Djokovic's career. In previous seasons, it is the red clay that has consistently derailed him in the majors. His failure to win the French Open has been at least in part due to Nadal's invincibility on the surface but the Spaniard seems to have lost that this year.

To write Nadal off in a tournament that he has won nine times in the last 10 years would be unthinkably foolish but there is little doubt that cracks have appeared in his game which have never been be quite so prominent before. This is the best chance that Djokovic has ever had to win the French Open, complete the career grand slam and retain the possibility of winning the calendar grand slam - and he knows it.

For the past few seasons, winning at Roland Garros has been Djokovic's primary aim. He likely acknowledges that overtaking either Federer or Nadal in terms of total grand slam victories is improbable so the most viable way of elevating himself to a similar stature is to complete the career grand slam. Winning the calendar-year grand slam would, potentially, raise him above the pair.

Djokovic's journey to this point is intriguing. This is the man who, in the early days, was seen as a light touch, someone who was mentally frail and physically fragile. He was called a hypochondriac, a joker, an idiot even. The transformation has been remarkable. He is now the clear world No.1 and is revered for his mental fortitude and physical strength. The Serb is loved for his humour, his charisma and his almost super-human level of tennis.

Despite the increased affection towards Djokovic, there remains, I feel, something of an under-appreciation of quite how magnificent a player he actually is. Federer is lauded for his skill, Nadal for his strength and his fight yet Djokovic's greatest qualities, his agility and athleticism, do not catch the eye quite as strikingly.

He is labelled as robotic at times yet this should not be a criticism. It is his unfailing consistency that results in these comparisons being drawn. When Djokovic dominated men's tennis in 2011 he was sublime. So far this season, he has been even better.

It would be a remarkable story were Djokovic to win the calendar-year grand slam, particularly when you consider his upbringing. He was born in the former Yugoslavia and grew up in the midst of conflict. His parents ran a pizza restaurant. As a young boy he crouched night after night in a bomb shelter during the war and he trained on courts that were unkempt and netless. He became one of the greatest tennis players the world has ever seen despite, or perhaps because of, this adversity.

In just over a fortnight we will know whether the calendar grand slam remains a possibility for Djokovic. Even if he triumphs at Roland Garros, he will still only be halfway there. When neither Federer nor Nadal could accomplish it, it seemed a feat that would never again be achieved. Martina Navratilova perhaps summarised Djokovic's chances best. "There are just so many things that have to go right," she said. "It's certainly not a probability, but it's definitely a possibility."