In pictures: Roger Federer begins chase for eighth title in Dubai

Roger Federer began his charge for a 100th career title by defeating Philipp Kohlschreiber 6-4, 3-6, 6-1 in the first round of the Dubai Championships at the Dubai Duty Free Tennis Stadium on Monday.
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Roger Federer waves to the crowd after his first-round victory over Philipp Kohlschreiber at the 2019 Dubai Duty Free Tennis Championships on Monday evening.
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Philipp Kohlschreiber faces seven-time Dubai champion Roger Federer in the first round of the 2019 Dubai Duty Free Tennis Championships.
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Spaniard Roberto Bautista Agut opens defense of his title against Indian wildcard Ramkumar Ramanathan at the 2019 Dubai Duty Free Tennis Championships on Monday.
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Indian wildcard Ramkumar Ramanathan plays defending champion Roberto Bautista Agut in the first round of the 2019 Dubai Duty Free Tennis Championships.
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Spain's Fernando Verdasco plays qualifier Thomas Fabbiano in the first round of the 2019 Dubai Duty Free Tennis Championships.
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Qualifier Thomas Fabbiano plays Spain's Fernando Verdasco in the first round of the 2019 Dubai Duty Free Tennis Championships.
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Nikoloz Basilashvili of Georgia upsets no. 4 seed Karen Khachanov in the first round of the 2019 Dubai Duty Free Tennis Championships.
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No. 4 seed Karen Khachanov falls to Nikoloz Basilashvili in the first round of the 2019 Dubai Duty Free Tennis Championships.
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No. 7 seed Milos Raonic serves to Jan-Lennard Struff in the first round of the 2019 Dubai Duty Free Tennis Championships.
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Damir Dzumhur of Bosnia and Herzegovina returns the ball in his mens singles first round match against Marton Fucsovics of Hungary on day one of the Dubai Duty Free Tennis Championship
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Marton Fucsovics of Hungary plays a forehand during his match against Damir Dzumhur of Bosnia and Herzegovina on day one of the Dubai Duty Free Tennis Championship
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Nikoloz Basilashvili and Matthew Ebden upset no. 2 seeds Raven Klaasen and Michael Venus in the first round of men's doubles at the 2019 Dubai Duty Free Tennis Championships.
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Rohan Bopanna and Divij Sharan play against wildcards Leander Paes and Benoit Paire in the first round of the 2019 Dubai Duty Free Tennis Championships.
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No. 2 seeds Raven Klaasen and Michael Venus fall to Basilashvili/Ebden in the first round of the 2019 Dubai Duty Free Tennis Championships.
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Wildcards Leander Paes and Benoit Paire defeat the all-Indian team of Rohan Bopanna and Divij Sharan in the first round of men's doubles at the 2019 Dubai Duty Free Tennis Championships.