Coria fought his way past Dutch favorite Robin Haase 6-3, 4-6, 6-4 and halted a five-match losing streak, which started in Barcelona back in April.
The fourth-seeded Massu, of Chile, defeated Swede Andreas Vinciguerra 7-6 (7-3), 6-3, and fifth-seeded Moya beat fellow Spaniard Guillermo Garcia-Lopez 6-4, 7-6 (8-6).
In other seeded action, No. 6 Spaniard Alberto Martin beat countryman Albert Montanes 6-2, 6-2, and Dutchman Thiemo De Bakker beat eighth-seeded French Open quarterfinalist Julien Benneteau of France 6-3, 6-3.
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