Andy Murray can move within sight of a semi-final place with victory over Rafael Nadal at the ATP World Tour Finals on Wednesday. The pair will meet in their second group match at 14:00 GMT.
Murray will qualify for the last four if he beats Nadal and the evening match sees any result other than a straight-set win for Stan Wawrinka.
A victory would also guarantee Murray the year-end number two ranking.
“It would be obviously nice to finish number two because I haven’t done it before, but it’s not a goal that I’d set for myself at the beginning of this year or throughout the whole year really,” said the Briton.
Qualification for the semi-finals would see Murray playing in London until at least Saturday, with Britain’s Davis Cup final against Belgium starting on the following Friday.
“I’ve only played two tournaments in the last seven or eight weeks really,” said the Scot.
“I feel good just now. Hopefully I can perform well here and in Belgium. I believe that I’ve given myself the best chance to do that.”
Murray, 28, trails Nadal 15-6 over eight years of professional meetings but won their only match this year on the Spaniard’s favoured clay in Madrid.
Nadal, 29, is seeded fifth in London but has been getting back to form in recent weeks and he too can qualify for the semi-finals on Wednesday.
“It’s an opportunity for me to compete against the number two of the world, a player who had a great season, a fantastic player in every surface, but especially in this one he likes to play,” said Nadal.
“I’m excited to play that match. I only take it as an opportunity to play against him, to try to play a good match. I’m going to try.”