In Pictures: Dubai Duty Free - Men's opening day

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  epa03600069 Paul-Henri Mathieu of France returns the ball to Andreas Seppi of Italy during the first round of the Dubai Duty Free Tennis ATP Championships in Dubai, United Arab Emirates, 25 February 2013. EPA/ALI HAIDER *** Local Caption *** 03600069.jpg

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  Andreas Seppi gestures during his match against Paul-Henri Mathieu in Dubai. Ali Haider/EPA

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  Florent Serra returns the ball to Daniel Brands in the opening round of the men's competition in Dubai. Ali Haider/EPA

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  Daniel Brands reacts during his match against Florent Serra. Ali Haider/EPA

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  Mikhail Youzhny returns the ball to Blaz Kavcic at the Aviation Club. Ali Haider/EPA

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  Blaz Kavcic plays a shot to Mikhail Youzhny. Ali Haider/EPA

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  Malek Jaziri shakes hand with Roger Federer after their match at the Dubai Duty Free Tennis Championship in Dubai. Ali Haider/EPA

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  Roger Federer returns the ball to Tunisia's Malek Jaziri during the first round of the Dubai Duty Free Tennis Championships. Ali Haider/EPA

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  Roger Federer leads a cake-cutting ceremony with chief executive Dubai Duty Free Colm McLoughlin, tournament director Salah Tahlak and Brad Drewett of the ATP. Ali Haider/EPA

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  Malek Jaziri serves the ball to Roger Federer at the Aviation Club. Karim Sahib/AFP

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  Marko and Novak Djokovic playing together against Nikolay Davydenko and Dick Norman in the opening doubles event at the Dubai Duty Free Tennis Championship. Antoine Robertson / The National