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Tue 3 Jan 2017 01:03 PM

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In pictures: Action from ATP World Tour in Doha, Qatar

Defending champion Novak Djokovic made a sticky return to action before recovering from losing the opening four games to beat Germany's Jan-Lennard Struff at the Qatar Open on Monday.

In pictures: Action from ATP World Tour in Doha, Qatar
Serbia's Novak Djokovic serves the ball to Jan-Lennard Struff of Germany, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)
In pictures: Action from ATP World Tour in Doha, Qatar
Serbia's Novak Djokovic returns the ball to Jan-Lennard Struff of Germany, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)
In pictures: Action from ATP World Tour in Doha, Qatar
Serbia's Novak Djokovic serves the ball to Jan-Lennard Struff of Germany, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)
In pictures: Action from ATP World Tour in Doha, Qatar
Jan-Lennard Struff of Germany serves the ball to Serbia's Novak Djokovic, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)
In pictures: Action from ATP World Tour in Doha, Qatar
Jan-Lennard Struff of Germany serves the ball to Serbia's Novak Djokovic, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)
In pictures: Action from ATP World Tour in Doha, Qatar
Serbia's Novak Djokovic returns the ball to Jan-Lennard Struff of Germany, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)
In pictures: Action from ATP World Tour in Doha, Qatar
Belgium's David Goffin reacts during his match with Robin Haase of the Netherlands, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)
In pictures: Action from ATP World Tour in Doha, Qatar
Robin Haase of the Netherlands returns the ball to Belgium's David Goffin, during the ATP Qatar Open tennis competition in Doha on January 2, 2017. (Karim Jaafar/AFP/Getty Images)