James Waterson reports the weekend’s tennis news. Petra Kvitova triumphed over Victoria Azarenka in three sets to win the WTA Championships in Istanbul on Sunday, her sixth title of the year. The win secured the No. 2 ranking for Kvitova, as well as a check for $1.75 million. Jo-Wilfried Tsonga and the Bryan Brothers were the winners in Vienna, Austria, while Marin Cilic defeated Janko Tipsarevic in St. Petersburg, Russia. Roger Federer and Novak Djokovic are back in action this week in Basel, Switzerland, while David Ferrer and Juan Martin del Potro are in Valencia, Spain. Finally, Robin Soderling may miss the first tournament of the year in Brisbane because of mononucleosis, and the Agassi College Preparatory Academy received a donation of $18 million.