World No.1 Rafael Nadal faces Stanislas Wawrinka before Tomas Berdych and David Ferrer aim to keep their interest in the tournament alive in the evening session.
Where to Watch
Rafael Nadal v Stanislas Wawrinka is live on Sky Sports HD3 and BBC Two HD no later than 2pm GMT. Live commentary is available on BBC Radio 5 live sports extra.
Tomas Berdych v David Ferrer is live on Sky Sports HD3 no later than 8pm GMT.
Rafael Nadal stands on the brink of history should he defeat Stanislas Wawrinka. The 13-time grand slam winner is a win away from securing the world No.1 at the end of 2013 and becoming the first player to ever achieve the feat having previously lost the ranking.
However, after reaching the semi-final at the Paris Masters, Nadal was forced to play his round robin match against David Ferrer on Tuesday meaning the Spaniard has a shorter rest period than Wawrinka, who won on the opening day against Tomas Berdych.
Nadal has however won all 11 of his meetings with Wawrinka, including on the hard courts of Shanghai and the Swiss faces a daunting task if he is to book his place in the last four on Wednesday.
The evening match is a straight shoot-out for the right to remain in the ATP World Tour finals. Ferrer lost in straight sets to Nadal on Tuesday and must win against Berdych, who claimed a set on the way to defeat against Wawrinka.
Ferrer leads the head-to-head 7-3 and has won four of the pair's five meetings on hard including at Paris last week. Neither player can afford to lose, particularly Berydch, who will face Nadal in his final round robin match.
What they said
Rafael Nadal: "It is always great when you win a match then have a day off to confirm the feelngs, to keep dong the things that you need to keep playing well. But the tournament decide that it is the other part of the draw, that they have the day off."
Stanislas Wawrinka: "I think it's the best surface to play him, for sure. For sure he's a much better player than me. He's No. 1 in the world. He's had an incredible year. It doesn't matter if I play him indoors or outdoors, it's going to be a tough match for me."
Tomas Berdych: "A losing start is not a good start. But there are still two more matches to go. The opponents on paper look even tougher. It's not going to be easy at all. There is o easy match from this tournament, definitely not."
David Ferrer: "I played a lot of matches these seven weeks. And now, you know, the quarterfinals, semi-finals and final in Paris was very close matches. I only have one day to rest. It is not an excuse. To beat these types of players it's very important to rest and to be in perfect condition."
Day 1 review: Wawrinka and Del Potro clinch opening wins
Day 2 review: Nadal thrashes Ferrer as Djokovic Outlasts Federer