WTA Championships Semis Set, Wozniacki Complains About Grunting

James Waterson and Lauren Lynch report the week’s tennis news. Petra Kvitova, Vera Zvonareva, Victoria Azarenka and Samantha Stosur advanced to the semifinals of the year-end WTA Championships on Friday. Marat Safin announced on Thursday he is running for Russia’s parliament, and Alex Bogomolov Jr., the fourth highest-ranked American, said he wants to play Davis Cup for Russia. Finally, Caroline Wozniacki and others have complained about grunting in the women’s game, resuming a conversation that has been going on since Monica Seles played in the 1990s.