This week-end in San Diego the Federation Cup 2010 final has been played between Italy and the U.S.A.

Kim Clijsters won the WTA Championship defeating Caroline Wozniacki in the final. For the Belgian it’s the third victory after the 2002 and 2003 ones, her first after she came back to tennis.

In a surprise ceremony held right after her last match at the WTA Championships in Doha Elena Dementieva announced her retirement from professional tennis.

Something curious happened today in the Linz tennis WTA tournament during the second round match between Ana Ivanovic and Barbora Zahlavova Strycova: after the first game the Serbian felt a little sick and asked the chair umpire to go to the toilet but when she came back she discovered she had been sanctioned with a penalty game.

Today Caroline Wozniacki officially becomes number 1 in the WTA ranking. The Danish player, though she’s from a Polish family, made the last step she needed to reach the first position thanks to the results she achieved in the Beijing tournament – in fact there was a little celebration on court – but world ranking is updated at the start of every week so only today Serena Williams’ dethroning is registered in the official ranking.