The championship will feature eight of the world's top 12 players: Rafael Nadal, Novak Djokovic, Andy Murray, Juan Martin Del Potro, Andy Roddick, Fernando Verdasco, Jo Wilfried Tsonga and Marin Cilic.
The other semi-final will see Fernando Verdasco of Spain, the number six seed, take on Marin Cilic after the Croat qualifier overcame Latvia's Ernests Gulbis 6-4 6-4.
Other seeds such as Tommy Haas, Fernando Verdasco, David Ferrer, Lleyton Hewitt, Gael Monfils and Marin Cilic also progressed along with former tournament runners-up Jo-Wilfried Tsonga, Marcos Baghdatis and Rainer Schuettler, but former world No. 7 Richard Gasquet was eliminated.