Flavia Pennetta of Italy celebrates after winning over Angelique Kerber of Germany during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)
Flavia Pennetta reacts during her fourth round match against Angelique Kerber of Germany at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)
Florian Mayer of Germany makes a backhand return to David Ferrer of Spain during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014. (AP Photo/Aijaz Rahi)
Flavia Pennetta of Italy makes a backhand return to Angelique Kerber of Germany during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)
Angelique Kerber of Germany makes a forehand return to Flavia Pennetta of Italy during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Eugene Hoshiko)
Flavia Pennetta of Italy celebrates a point won against Agelique Kerber of Germany during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Aaron Favila)
Angelique Kerber of Germany reacts between points as she plays Flavia Pennetta of Italy during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Eugene Hoshiko)
Flavia Pennetta of Italy bites the net in frustration during her fourth round match against Angelique Kerber of Germany at the Australian Open tennis championship in Melbourne, Australia, Sunday, Jan. 19, 2014.(AP Photo/Eugene Hoshiko)
Germany's Eric Frenzel soars through the air during the trial round on day two of the Nordic Combined triple World Cup in Seefeld, Austria, Saturday, Jan. 18, 2014. (AP Photo/Michael Probst)
Germany's Eric Frenzel skis to win day two of the Nordic Combined triple World Cup in Seefeld, Austria, Saturday, Jan. 18, 2014. (AP Photo/Michael Probst)
Germany's Eric Frenzel celebrates after winning day two of the Nordic Combined triple World Cup in Seefeld, Austria, Saturday, Jan. 18, 2014. (AP Photo/Michael Probst)
Germany's winner Eric Fenzel holds up his skis on day one of the Nordic Combined triple World Cup in Seefeld, Austria, Friday, Jan. 17, 2014. (AP Photo/Michael Probst)
Germany's Aliona Savchenko and Robin Szolkowy perform in the pairs short program at the European Figure Skating Championships in Budapest, Hungary, Friday, Jan. 17, 2014. (AP Photo/Darko Bandic)
Germany's Eric Frenzel soars through the air during the ski jumping portion on day one of the Nordic Combined triple World Cup in Seefeld, Austria, Friday, Jan. 17, 2014. (AP Photo/Michael Probst)
Jerzy Janowicz of Poland takes a rest between games during his third round match against Florian Mayer of Germany at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014. (AP Photo/Shuji Kajiyama)
Jerzy Janowicz of Poland pours water over himself during his third round loss to Florian Mayer of Germany at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Aijaz Rahi)
Florian Mayer of Germany makes a forehand return to Jerzy Janowicz of Poland during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014. (AP Photo/Shuji Kajiyama)
Angelique Kerber, left, of Germany is congratulated by Alison Riske of the U.S. during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday, Jan. 17, 2014.(AP Photo/Rick Rycroft)
A high wall of concrete blocks, topped with barbed wire, divides Sebastian Strasse in the Kreuzberg district of Berlin, Germany, on Feb. 15, 1962. To the left is the American sector and beyond the wall to the right is the Russian sector. (AP Photo)