France's Julien Benneteau celebrates winning a point against sixth seed Andy Roddick.
The Frenchman had Roddick on the ropes after the first set but eventually went down 4-6, 6-3, 6-2.
With Roddick's victory, it is the first time since 1987 in Miami that six of the Top 10 seeds have reached the quarterfinals.
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