World number one Novak Djokovic advanced to quarter-finals of Dubai tournament after a tough match against Ukraine’s Sergiy Stakhovsky (7:6, 6:3).
In the next round he will face fellow Serbian Janko Tipsarevic.
The eighth-seeded Argentinean Juan Martin del Potro defeated Andrey Golubev and will meet with France’s Jo-Wilfried Tsonga.
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