Rafael Nadal will look for his first ever ATP World Tour Finals title when the world number one takes on the seemingly unstoppable Novak Djokovic in the decider.
Nadal has had a great tournament so far in London, winning all three of his group games, before easing past great rival Roger Federer 7-5, 6-3 in the semifinals on Sunday.
The Spaniard has made a remarkable comeback from a long-term knee injury, and will not hold back in the final as he looks to cap off a stunning year with victory over Djokovic.
"For me every match means a lot and every tournament means a lot, but it's true that this tournament is special and I never had the chance to win here," Nadal said.
"So it will be great if I have the chance to finish the year with a victory. But I know a lot of work remains and probably the most difficult one is still to come.
"I think if I don't play my best tomorrow [Monday], I don't have a chance. I need to play more aggressive."
Djokovic has been near unbeatable in the last couple of months, after losing to Nadal in the US Open final. The Serbian conquered China with title wins in Beijing and Shanghai, before lifting the Paris Masters.
The world number two, unbeaten in 21 matches, is also on a terrific run in London and, having already beaten Nadal in Beijing, will be in confident mood of winning his third ATP World Tour Finals title.
"It's going to be a great final," the 26-year-old said. "I hope all the crowd will enjoy it because we definitely do on the court.
"It's always a thrilling competition between me and Rafa. Let's say we know each other quite well. There'll be no secret between us on the court. The better will win."
Nadal holds a 22-16 edge over Djokovic in 38 clashes, but the latter will probably start the slight favourite in the final, owing to the Spaniard's struggles on the indoor surface.
"The most important thing is on the toughest surface for me to play, I have been able to win four matches against top-eight players," Nadal said.
"Now there remains the last match. I hope to be ready for that. I know it's going to be a difficult one and I need to play my best match to have a chance."
Where to watch
The match is scheduled for a 1.30 am IST start on Tuesday morning with live coverage on Ten Sports, Ten HD, Star Sports 4 and Star Sports HD1.