Djokovic and Murray headline Hopman Cup
Historically, Doha has attracted a fairly strong field. In 2010 and in 2009, Roger Federer and Rafael Nadal played. Andy Murray won in 2009 and 2008. Nikolay Davydenko is perhaps the most regular participant in this event that's so far away from Australia. Last year, Andy Murray opted not to defend his title at Doha.