Davydenko, the world's sixth-ranked men's player, topped Austria's Jurgen Melzer 6-3, 6-2.
Robin Soderling of Sweden, the third seed and 2009 French Open runner-up, trounced France's Julien Benneteau 6-0, 6-1 in 64 minutes, and sixth-seeded Mikhail Youzhny of Russia knocked off No. 4 seed Gael Monfils of France 5-7, 6-2, 6-3.
Soderling was so dominant he won 22 of 32 points on Benneteau's serve.
Saturday's semifinals are Davydenko-Soderling and Youzhny against top-seeded Novak Djokovic, the world No. 2 in the latest men's rankings.
The 2010 Rotterdam champion will claim $380,000 following Sunday's final.
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