Top seeds Leander Paes and Lukas Dlouhy laboured to the doubles quarter-finals in the UNICEF Open with a hard-earned win over Florent Serra and Kristof V Liegen in s'Hertogenbosch, The Netherlands. The Indo-Czech pair quelled a late challenge from the French-Belgian pair, winning 6-1, 6-7(5), 10-6, in the opening round of the euro 450,000 grass court event.