Second seed Stanislas Wawrinka highlighted Thursday's quarterfinal winners at the $545,000 Topshelf Open, a final grass-court Wimbledon tune-up.
The world No. 10 Swiss star defeated fifth-seeded Frenchman Jeremy Chardy 6-4, 7-6 (7-2) in 75 minutes on Day 5 at Autotron Rosmalen. Wawrinka is now 4-0 lifetime against Chardy.
Wawrinka, who is the only seed left standing this week, will meet Spaniard Guillermo Garcia-Lopez in Friday's semifinals. Garcia-Lopez whipped Czech Jan Hernych 6-4, 6-1 to reach the final four. The qualifier Hernych was a Den Bosch runner-up in 2006.
Friday's other semi will pit Belgian Xavier Malisse against Frenchman Nicolas Mahut. Malisse handled Spaniard Roberto Bautista Agut 6-4, 6-4, while the qualifier Mahut topped Russian Evgeny Donskoy 6-3, 7-6 (7-1).
The tour veterans Malisse and Mahut will meet for the first time in seven years, with Mahut taking their last meeting on some grass in Nottingham in 2006.
This week's champion will earn $94,000.