Angelique Kerber, of Germany, returns to Peng Shuai, of China, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)
Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)
Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)
Angelique Kerber, of Germany, celebrates after defeating 6-3, 1-6, 7-6, Peng Shuai, of China, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)
Zenit supporters burn a German flag during the Champions League round of 16 second leg soccer match between Borussia Dortmund and FC Zenit in Dortmund, Germany, Wednesday, March19,2014. (AP Photo/Frank Augstein)
In this Feb. 15, 2014 file picture Germany's Maria Hoefl-Riesch celebrates after finishing the women's super-G at the Sochi 2014 Winter Olympics, Saturday, Feb. 15, 2014, in Krasnaya Polyana, Russia. Three-time Olympic champion Maria Hoefl-Riesch of Germany is retiring from Alpine skiing. Hoefl-Riesch told reporters in Munich on Thursday March 20, 2014 that her decision was "to end my career now." The 29-year-old German was the 2011 overall World Cup winner. (AP Photo/Gero Breloe, file)
FILE - In this Feb. 15, 2014 file picture Germany's Maria Hoefl-Riesch poses with her gold and silver medal at the German house at the 2014 Winter Olympics in Krasnaya Polyana, Russia. Three-time Olympic champion Maria Hoefl-Riesch of Germany is retiring from Alpine skiing. Hoefl-Riesch told reporters in Munich on Thursday March 20, 2014 that her decision was "to end my career now." The 29-year-old German was the 2011 overall World Cup winner. (AP Photo/Gero Breloer,File)