It is definitely fair to say that the likes of Federer, Nadal and Djokovic will stay in the business for at least some years to come, but it may be worth to look at some of the talents that may find themselves fighting for at least some of the Grand Slam titles in the future. They are all under 20 years of age and have already proven themselves in some tough matches. Which 5 players are we talking about?

5. Christian Lindell

Nobody knows this guy – that is the bland truth. He does not play flashy matches full of inspiration yet, but he had many solid results on clay this year. He took a set off Nieminen and Bellucci (both are great on clay, especially Bellucci) and defeated a number of players from the top 200. As we all know, sometimes it may be better if you start slow and that is what this guy is doing – not going out to the big stage yet, but playing well and winning matches – that is what counts. There is no pressure on him, which can be a great advantage for the future – we have already seen many talents go to waste just because of not coming to terms with expectations. Sweden can soon have another great player out there and if Soderling is still worried about the future of tennis in Sweden, he should not be. This is our wildcard in the list – he does not have a lot of hype surrounding him, but he should not be overlooked.

4. Filip Krajinovic

The Serbs already have a lot of great players and this one may join the ranks of Djokovic, Tipsarevic and Troicki very early. Some famous tennis coaches say his style reminds them of young Andre Agassi – and we all know what that can mean. He has already beaten a number of solid players (Zeballos) and taken sets off James Blake and Marcel Granollers. And he is only 18 years old! Unfortunately, it seems that he is motivated only for big matches, as he often struggles against poor players. All in all, the potential is there, but he still needs to get a lot practice and competitive matches under his belt, otherwise he may never accomplish anything. Let's hope that he overcomes all that, so we can see another great player on the ATP circuit in the years to come.

3. Milos Raonic

Milos Raonic is too good to be left out after his performance at the end of this year. During the Asian tour, he beat Sergey Stakhovsky and Florent Serra. He also played a tight match with Nadal – the Spaniard could not return his serve consistently. Really solid stuff. His powerful serve also allows him to be pretty consistent – and that is very important at this stage of career. He will draw a lot of confidence and motivation from the end of this season and if he can start well next year, who knows what can happen. Unfortunately, it seems that he is quite prone to injuries and that may well hamper his progress. We have not had many successful players from Canada yet, but we may be looking at a future champion here.

2. Ryan Harrison

One of the few young Americans that look like possible contenders. He is one of the few players that have won an ATP level match before they were 16. The big tournament for him this year was the US Open. In the first round, he defeated the 15th seed, Ivan Ljubicic, in spectacular style. His serve was working and he was able to defend well enough on the return. And even though he has lost the next match (still, he had three match points) against Sergey Stakhovsky, he has surely taken a lot of confidence from his run in the tournament and will be looking to repeat the performance again. Otherwise, he is just like any other American player – he is very solid on hard courts, but unconvincing anywhere else. Nevertheless, his focus on powerful serve and effective ground strokes will allow him to progress further easily. And although I am not convinced that he will ever rise to the very top, I can certainly see him getting to the top 50 soon enough to fight for his chance. If anyone can follow in the footsteps of Andy Roddick, it is this guy.

1. Grigor Dimitrov

Most people have not heard of him yet, but he has the talent to become a top ten player if he continues to improve in the future. Still lacking experience, but he is just 19 years old, so he does have a lot of time – and he is almost in the top 100 already. He has already faced the likes of Nadal and Llodra and he has not cracked under pressure in those matches as so many youngsters do. In fact, he has beaten Michael Llodra in their last meeting. Some famous trainers and players claim that he may have more talent than Roger Federer. It is definitely too early to say that he will ever become as good as the Swiss player, but we reckon that he might come close with enough training and support (and obviously some luck). He has some brilliant ground strokes, with one-handed backhand being one of his biggest upsets. It is fair to say, however, that he still has to improve in the fitness department. Finally, he is still way too inconsistent. Yes, he has beaten Llodra already. But on the other hand, he has also lost against a number of poor players this year, including Vagnozzi, Crugnola and Millman.

Do you agree with our selections? Or is your favorite youngster missing from the list? Tell us what you think in the forums! We are already looking forward to your comments and suggestions.