After winning the US Open on Sunday, Novak Djokovic became only the eighth man in the history of the game to claim ten grand slams.
The world number one has competed in all four of this year's slam finals- only losing out at the French Open to Stan Wawrinka. No one can argue that the multiple slam champion is the premier player in the world at the moment.
The Serbian is also guaranteed to finish the year as the world's top player, the fourth time in five years; only bettered by Roger Federer, Pete Sampras and Jimmy Connors.
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So how many slams can he win? Well he needs just three more to overtake Rod Laver, Bjorn Borg and Roy Emerson and if is to achieve that then Rafael Nadal and Pete Sampras will be in touching distance at 14.
Roger Federer, who is considered as the best ever, holds the record at 17. You would think that at the age of 28 it would be very unlikely that Djokovic could eclipse the Swiss player. But with his almost unbelievable levels of energy and fitness, bags full of talent, every shot in the book and being comfortable on all surfaces, you wouldn't bet against him.
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What's the secret?
Many athletes could have a look at the US Open champion's diet for starters. In 2010, when there were slight questions marks over his fitness, Djokovic cut wheat, gluten and dairy from his diet and reduced his sugar intake. All foods that are known to be harder for the body to digest creating an extra workload for the body as a whole.
Along with his diet, Djokovic is in-tune with his natural body clock when it comes things like the intestinal track and what time of day it is working to remove toxins from the body, which is believed to be between 5am and 7am. The tennis star drinks a glass of warm water when he wakes to aid this process. It all comes from the traditional Chinese medicinal beliefs that parts of the body heal at certain times of the day.
We cannot argue with the results. Since 2010 Djokovic has won nine of his ten slams and has been at the top of the men's game.
Who can stop him?
OK, we know it is historically difficult for players to win grand slams after the age of 30, something Djokovic will have to do if he is to become the greatest player of all time. But if he continues his current dominance of the sport for the next three or four years, he will come very close to achieving what has to be his ultimate goal.
Many believed that Roger Federer had a great chance of halting the only player that sits above him in the world. The world number two couldn't have played any better going into the US Open final on Sunday but fell short over four sets. It is difficult to see how he can raise his game even more, especially at the age of 34.
So if Federer can't do it, who can? We know that Andy Murray can beat Djokovic at the biggest events, notably defeating him in the 2012 US Open and 2013 Wimbledon finals. But even though he did beat Djokovic recently at the Montreal Masters, the Scot had lost every meeting between the two since that Wimbledon final of 2013. It is clear that the two-time Slam champion has to be at his absolute best to triumph and even then it is sometimes not enough.
Rafael Nadal doesn't seem to be anywhere near competing for titles as he struggles to reach his best after injury. Others that could maybe challenge is Kei Nishikori, who has shown grand slam winning potential but has also struggled with injuries.
There is a growing generation of young players, including Borna Coric and Nick Kyrgios, but it is obvious that these players will need more time to evolve before they can challenge Djokovic. That may just give him enough time to take the biggest haul of grand slams from the great Roger Federer.
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