Rafael Nadal & Roger Federer set for ATP London final

Rafael Nadal and Roger Federer will meet in a potential blockbuster of a final between the world's two best players at the ATP World Tour Finals on Sunday.

Spaniard Nadal will attempt to win the year-end crown for the first time while Switzerland's Federer will be going for his fifth title when the pair meet at 1730 GMT.

It will be the 22nd meeting between two players already well established among the greatest the sport has ever produced, and their first in London since Nadal's epic Wimbledon victory in 2008.

"It's the same city, a few miles away," Federer said. "But honestly, I don't even think about that for one second preparing for Sunday's match. It's more of a broad approach thinking back over what has happened the last few months in my game."

606: DEBATE I'm a fed fan but I don't think he can do it. I see a lot of unforced errors from the great man Castor_Troy

Nadal and Federer's dominance is such that they have shared an incredible 21 of the last 23 Grand Slam titles, with the 29-year-old Swiss having won a record 16 major titles and the Spaniard, five years his junior, closing fast on nine.

Nadal has enjoyed an incredible year in which he picked up the French Open, Wimbledon and US Open titles, with the victory in New York completing his Grand Slam set, and another win on Sunday would bring him the last remaining significant title missing from his CV.

Federer has had a relatively ordinary season by his own extremely lofty standards but won the Australian Open in January and remains second in the world rankings.

And both men have been in tremendous form in London, Federer making the final without dropping a set and Nadal going unbeaten through the group stages after failing to win a single set on his O2 debut in 2009.

Playing indoors has always proved the biggest challenge for Nadal and, although he holds a commanding 14-7 lead against Federer overall, the Swiss has won both their previous matches under cover.

"The surface is not too slow, it's not too quick," Nadal added. "But here, when you play against the best players in the world, they are more specialists than me in these kinds of surfaces.

"I said before the tournament that here you don't have a big chance to defend if you are not playing very well, by playing higher balls to try and find a solution. The only way here is to play aggressive. You can play defensive for moments but you have to come back to the attack."

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Nadal certainly proved he has made the necessary adjustments in his three-hour win over Murray on Saturday, and the Spaniard admitted that he was feeling the affects of that effort.

"I don't know what's going to happen tomorrow, how I'm going to feel," Nadal stated. "You can imagine, right now I am very tired. That's the truth."

Federer might have a losing record against Nadal but he expects to be as excited as the 17,500 spectators inside the O2 Arena for Sunday's final.

"I'm really looking forward to playing against Rafa," Federer said. "Who wouldn't? I'm no different.

"What he's achieved is amazing at his age, to win the career Grand Slam, and he already has three in a row again on another great streak. He's obviously a wonderful player, he's proven himself he can play on any surface. The ones who still call him a clay-court expert, they still don't know much about tennis."

The pair have met just once this year, with Nadal winning on clay in Madrid, and Federer knows he must take advantage of the indoor conditions on Sunday.

"We haven't played in a long time," Federer continued. "I'll try to take it to him, play aggressive, attack his second serve, see how it goes."

And when asked whether he expected Nadal to suffer physically after his lengthy semi-final, Federer responded: "I don't think it's going to have much effect on him, to be honest. He's been done a few hours now, he might be tucked up in bed already while I'm still doing my press conference here.

"That's his advantage, that he played early."