Juan Martín Del Potro has been practicing since Monday in the Glasgow Arena where this weekend Argentina will play Great Britain in the Davis Cup semifinals. The Former World No. 4 said he is 'very excited' after the quarter-finals reached at the US Open, but also a little bit tired. 'I did not have the chance to rest since Rio and it will be another effort but you know that to win a medal is always a big challenge.

Now I hope to be competitive in this tie. They are the favourites and not only because there is Murray. There are Evans, Edmund, Jamie (Murray), who won US Open doubles finals. Better than this they cannot be. We approach this tie with humility and excitement hoping to qualify for the final', said Delpo, who Speaking in detail about Andy Murray added: 'He is probably the smartest player.

He is a variety game, so far he did not win more Grand Slam titles or has not been World No. 1 because of the Big 3. He and Federer are the most complicated players to face because they know how to play me.' This week Del Potro is back in the Top 100 of the ATP Rankings again, at the World No.

64: 'It's nice to have two numbers again despite the thing that makes me most happy is that I am at a high level. My big challenge was not only to play tennis but do it well and being healthy through all the season.