Serena Williams pulls out Hours before scheduled clash with Serena Williams . Hours after losing Victoria Azarenka to injury , organizers of the Dubai Tennis Championships were dealt another major blow on Wednesday when Serena Williams also pulled out of the event . World No . 1 says back problem has troubled her for the past fortnight . Belorussian targets next month 's CNN Ericsson Open in France for comeback .
Serena Williams pulls out Hours before scheduled clash with Serena Williams . World No . 1 says back problem has troubled her for the past fortnight . Belorussian targets next month 's CNN Ericsson Open in France for comeback .