Leander Paes and Canadian Daniel Nestor will play against second seeds Marcin Matkowski of Poland and Nenad Zimonjic of Serbia in the semifinals of the Men's Doubles at the ATP Aegon Championships today. Leander Paes pairing with Daniel Nestor defeated unseeded Spanish duo of Marc Lopez and Rafael Nadal in straight sets 7-6, 6-4 in the quarterfinals of the grass court tournament at the Queen's Club in London.