Top seeds Leander Paes and Lukas Dlouhy enter the semi-finals of the UNICEF Open Tennis after defeating Thiemo de Bakker and Robin Haase in straight sets in The Netherlands.The Indo-Czech pair carved out a 7-5, 6-3 over the Dutch wild card entrants in the quarter-finals.The French Open runners-up broke their rivals five times and took one hour and 11 minutes to complete the win.They will now fight it out with Benjamin Becker of Germany and American Scott Lipsky for a place in the summit clash.