Tennis Now News Update: December 5, 2011

James Waterson reports this week's news for Tennis Now. Rafael Nadal overcame Juan Martin del Potro in four sets to clinch Spain’s fifth Davis Cup title, and their third within the last four years. Meanwhile, Venus and Serena Williams were back in action in Milan, where they were taking on Flavia Pennetta and Francesca Schiavone in an exhibition. Finally, the Australian Open has given former World No. 1 Lleyton Hewitt a wildcard to the first Grand Slam tournament of the year.