Spain's Rafael Nadal returns a ball during a training session for the upcoming Davis Cup final in Seville, Nov 29, 2011. [Photo/Agencies]

Fatigue among Spain's players could help a well-prepared Argentina spring a surprise at this week's Davis Cup final in Seville.

Spain have won the competition four times in 11 years, are unbeaten in 20 home ties and will be playing on their preferred clay-court surface in front of a noisy home crowd but Rafa Nadal and David Ferrer are going into the match less than fresh.

World number two Nadal and fifth-ranked Ferrer competed at the season-ending ATP Tour Finals in London last week, the latter reaching the semi-finals before falling to eventual winner Roger Federer.

"We're all physically tired but this is a final so it's the last push," Ferrer told a news conference on Tuesday. "We want to get this victory ... for us this is very important."

Argentina's David Nalbandian wipes sweat during a training session for the upcoming Davis Cup final in Seville, Nov 29, 2011. [Photo/Agencies]

While Nadal and Ferrer were slugging it out in London, Argentina were training on clay courts in Barcelona before moving down to Seville to complete their preparations.

"The players have been making a big effort over the last three weeks," Argentina captain Tito Vazquez said.

"They have sacrificed their normal schedule and devoted energy to this tie. I'm very proud of them."

World number 11 Juan Martin del Potro and 64th-ranked David Nalbandian have not played a competitive match since October and it remains to be seen whether the break will have given the two Argentines an edge.

"Maybe we are slight favourites but we have to show it on the court," said Spain captain Albert Costa.

"Argentina are a very strong team and they play very well in the Davis Cup so it's going to be tough."

The draw takes place on Thursday and play starts on Friday.

Spain's David Ferrer touches his eye during a training session for the upcoming Davis Cup final in Seville, Nov 29, 2011. [Photo/Agencies]