Tursunov, who defeated former world No. 1 Spaniard Carlos Moya 6-3, 6-3 earlier in the week, beat seventh- seeded Czech Radek Stepanek 6-3, 6-4 Saturday. Mathieu advanced with a 7-6, (10-8), 7-6 (7-1) win over Frenchman Adrian Mannarino.
Mannarino, 20, was playing in just his second ATP-level event.
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