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Novak Djokovic eased into the quarter-finals at the Dubai Championships with a dominant 6-2, 6-3 win over Tallon Griekspoor.
Djokovic extended his winning streak to 19 matches, a day after being pushed to a third-set tiebreaker by 130th-ranked Tomas Machac.
The 35-year-old Serb broke the 39th-ranked Griekspoor four times to remain unbeaten this season.
It was Djokovic's second match since winning his 10th Australian Open title .
The five-time Dubai champion had taken a few weeks off after overcoming a hamstring problem in Australia to win his record-equalling 22nd Grand Slam singles title.
Djokovic will next face either Hubert Hurkacz or qualifier Pavel Kotov for a spot in the semi-finals