Fourth-seeded Mirnyi beat Russian Evgeniy Kirillov 6-1, 6-3. Sixth-seeded Kiefer, who reached the final here in 2001, beat fellow German Alexander Popp 6-4, 6-1, and seventh-seeded Andreev defeated German Philipp Kohlschreiber 6-4, 6-2.
This week's top seed is defending champion Nikolay Davydenko of Russia, who beat Britain's Greg Rusedski in last year's indoor finale here.
Rosie O'Donnell unveils nearly 50-pound weight loss
Members of Congress to keep receiving porn magazine