Roger Federer has heaped plenty of praise on US Open finalist Juan Martin del Potro and believes that his professionalism and character is unrivalled.

As reported on the Tennis World USA, Federer is a big fan of the Argentine’s caring nature off the court.

Del Potro’s impressive run at the US Open came to an end in the final as he was defeated by Novak Djokovic in straight sets.

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Del Potro’s early career was blighted with injury and many believe that if he managed to remain fit and healthy then he could have been challenging for the world number one spot.

However, he has worked hard to regain his fitness and form and he is now widely considered one of the toughest opponents in the sport.

When speaking to GQ Magazine about him, Federer said:

When I see Delpo he’s always very caring, and when he asks, “How are you doing?” it’s not just to be nice. He really does care very dearly about your answer.

It’s not just like, “Okay, see you later, I’ve got to go.” But I hope that Juan Martin doesn’t try to please everybody.

I can’t please everybody. If you’re trying to please everybody, that’s greasy. I think Juan Martín is very aware that he has an important role to play for the fans, especially for South America, and he takes it seriously.

20-time grand slam winner Federer has not been in the best form recently, which has allowed players like Del Potro to have the opportunity to get to the later stages of tournaments.