Russia&#39;s Nikolay Davydenko returns the ball to Victor Hanescu of Romania during the first day of the 2013 ATP Qatar Open in Doha on December 31, 2012. Davydenko, one of only a handful of players to have beaten Rafael Nadal and Roger Federer in the same tournament, has a new year&#39;s resolution of making a last bid to return the world&#39;s top 20 before retirement
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