Djokovic was joined by the tournament's other top seeds in posting decisive straight-sets wins. Djokovic will go against fourth-seeded Juan Marin del Potro in the semifinals while second-seeded Roger Federer, the tournament defending champion, meets No. 3-seeded Tomas Berdych.
Djokovic's 65-minute outing was the longest match of the quarterfinals.
Djokovic won the first seven games en route to a 6-0, 6-3 defeat of Andreas Seppi. He won 62 percent of the points in the match and lost only 16 points in eight games serving.
Federer's 6-2, 6-2 win over Nikolay Davydenko capped the quarterfinals. Federer bettered Davydenko in that he lost eight points in eight service games in the 54-minute match. He is 19-2 lifetime versus Davydenko.
Berdych handled Dmitry Tursunov 6-3, 6-2 and won 79 percent of the points on serve while del Potro eliminated Daniel Brands 6-4, 6-2, taking 78 percent of the points when serving.
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