Nalbandian will face Nikolay Davydenko in the last four after Rafael Nadal pulled out with a knee injury, while second seed Roger Federer earlier withdrew ahead of his match with James Blake because of a stiff back.
The visitors had their first chance when Robbie Blake forced England goalkeeper David James into a save.
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He will next face the winner of a later match between American James Blake and 15th-seeded Canadian Milos Raonic.
The 21-year-old Argentine came into the tournament with a wrist problem, and dropped sets in each of his opening three matches - including a gruelling five-set win over James Blake.
In the accompanying men's tournament, James Blake saw off fellow American and fifth seed Sam Querrey with a 4-6 6-3 6-4 first-round win.
Amid the overkill, there are scenes of a sudden and startling beauty, and the impotent ranks of teachers are played by a cast of surprising (if underused) power, including Marcia Gay Harden, Christina Hendricks, Blythe Danner, William Petersen, Lucy Liu, a tweedy Tim Blake Nelson, and, best of all, James Caan.
From Henry's lay-off, Halford flicked the ball in the air and volleyed through a sea of players, but James pushed the ball wide and Ebanks-Blake smashed the rebound off target.
James, equal pay advocate Lilly Ledbetter and Blake Jones, the co-founder and president of a solar electric company.
The reward for Rochus is a third-round clash with Brazilian 27th seed Tomaz Bellucci, who defeated American James Blake 3-6 6-1 6-2.
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American James Blake lost 4-6 7-6 6-4 to Croatia's Ivo Karlovic, a defeat that gives Andy Murray renewed hope of reaching the season-ending Masters Cup.
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