It's win or go home for Andy Murray and Stanislas Wawrinka as the two players clash in the final group stage match of the ATP World Tour Finals in London.
With Rafael Nadal, Roger Federer and Novak Djokovic booking their places in the semifinals, only one spot remains, and it will go to the winner of the second match of the Ilie Nastasic Group on Friday.
Nadal will play already-eliminated David Ferrer in the first match, but all eyes will be on the second one, when Murray and Wawrinka face-off at the O2 Arena.
Both players have had one solid match and one poor one, with the latter coming against Nadal.
Wawrinka started off the ATP World Tour Finals in pathetic fashion, completely losing his game against Nadal. However, the Swiss bounced back with a 7-5, 6-2 win over Ferrer, a win which kept him in contention for a semifinal place.
"My game has started to feel better out there," Wawrinka said after his impressive win over the Spaniard. "I didn't start well.
"I started to play a little bit better the middle of the first set. I'm a little bit lucky he gave me back the game to come back. I'm quite happy with the win, especially to turn around the first set and finish that way."
Wawrinka will hope to start well and finish better against Murray, who is coming off a lopsided loss to Nadal, having dispatched Ferrer in straight sets in his opening match.
Much has been spoken about Murray's mind being elsewhere, with the Davis Cup final set to begin in less than a week, but the Brit will, no doubt, want to go as far as possible in this season-ending tournament as well.
"Sometimes he [Wawrinka] can make a bunch of errors, and then, in the space of a couple of games, can completely change and start hitting winners from all over the court," Murray said when questioned about what to expect from his opponent.
"He's a tough guy to play against for that reason. He has a lot of power and he can almost take the racket out of your hand at times."
Where to Watch Live
Andy Murray vs Stanislas Wawrinka is scheduled for an 8 pm local time (3 pm ET, 1.30 am IST) start. Star Sports 4, Star Sports HD4, Ten Sports and Ten HD will broadcast the final group match of the ATP World Tour Finals 2015 live in India, while Murray vs Wawrinka can also be watched via online live streaming on, Starsports.com, Hotstar, Ten Sports Live.
Audience in the US can catch the action on ESPN 3, while the match can also be live streamed on Watch ESPN. Viewers in the UK can watch Andy Murray vs Stanislas Wawrinka live on Sky Sports, with the live stream option on Sky Go.
Viewers from across the world can watch the World Tour Finals action live on ATP's official website.