Del Potro to meet Haas in Semi-final

Juan Martin Del Potro the number one seed is into the semi-final of the Citi Open in Washington. Del Potro was in great form beating the big serving South African Kevin Anderson in straight sets 7-6 6-3. In the last four Del Potro will play inform Tommy Haas who beat Grigor Dimitrov 7-6 7-6.