American James Blake eased into the semi-finals of the U.S Clay Court Championship after a comfortable 6-4 6-3 win over Argentine Agustin Calleri.

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The top seeded world number eight will face Oscar Hernandez of Spain in Saturday's semi-finals.

Hernandez made the last four for the first time in an ATP event after he upset third seed, and 2006 champion, Mardy Fish 6-2 7-6.

American Wayne Odesnik and Spain's Marcel Granollers-Pujol will meet in the other semi-final.

Odesnik came from behind for a 2-6 7-6 6-1 win over Argentine Sergio Roitman.

The 22-year-old Odesnik entered the tournament having played just one previous ATP clay court match and converted seven of 16 break points while saving five of 11 break points to advance.

Seventh seed Granollers-Pujol defeated Brazilian Marcos Daniel 6-3 6-2, converting five of seven break points and only losing his serve once.