Andy Murray will play world number one, Rafael Nadal, at the Barclays ATP World Tour Finals at the O2 arena in North Greenwich this afternoon.
Nadal secured top position in Group A after beating Wimbledon finalist, Tomas Berdych, in an impressive straight sets win yesterday afternoon.
Murray and Nadal have already met three times this year with the Scot winning two of those encounters - notably both times they played on a hard surface.
The second semi final will take place tonight between Group B winner, Roger Federer, and Group A runner-up, Novak Djokovic.
The winners of the semi finals will play on Sunday, when the Barclays ATP World Tour Finals 2010 Champion will be crowned.