(CNN) -- Top-seed Andy Roddick stepped up his bid for a fourth tournament victory in San Jose with a 7-5 6-4 win over Germany's Tommy Haas on Friday night.
Roddick was pleased with his form as he eased into the semifinals in San Jose.
Home players have dominated in California with Roddick joined in the semifinals by James Blake and Mardy Fish.
Czech Radek Stepanek prevented a clean sweep when he beat American qualifier Todd Wisdom after dropping the opening set.
Stepanek duly took the next two without dropping a game for a 7-5 6-0 6-0 victory to earn a clash with Roddick.
Blake beat American compatriot Sam Querrey 7-6 6-3 but the big upset of the day saw Fish beat world number seven and second seed Juan Martin del Potro of Argentina 6-3 6-4.
After good friends Blake and Fish face each other for a final place on Saturday afternoon they will then pair up to play in the doubles.
Roddick, who advanced to the semifinals of the Australian Open before losing to Roger Federer, has continued his good form in San Jose, securing a single break in each set against Haas to secure victory.