Fourth seed Andy Roddick ended the surprise run of Simon Greul when he beat the German qualifier 6-3, 3-6, 6-2 in the Miami Open Masters Series event this morning.
The win moved the American into the quarter-finals.
Greul, ranked 130th in the world, went into the match having previously knocked out Paradorn Srichaphan, Dominik Hrbaty and Tim Henman.
The 24-year-old made Roddick work hard for his win, the American advancing on his third match point after a contest lasting one hour 33 minutes.
Roddick, the 2004 champion, has yet to reach a final this season.
Croatian Davis Cup team-mates Mario Ancic and Ivan Ljubicic progressed with the minimum of fuss.
Ancic, the 22nd seed, upset Russian fifth seed Nikolay Davydenko 7-5, 6-4 while number six Ljubicic swept past Belgian Christophe Rochus 6-3, 6-1.
Ljubicic, who hit 13 aces, next meets unseeded Argentine Agustin Calleri, a 3-6, 6-3, 7-5 winner over 16th seed Nicolas Kiefer of Germany.
Later today top seed Roger Federer will face Russian Dmitry Tursunov.
In the women's event Russian 12th seed Svetlana Kuznetsova became the first player to reach the last four with a 6-0, 7-6 triumph over Ai Sugiyama of Japan.
-REUTERS
Tennis: Roddick ends qualifier's dream run
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