Angelique Kerber

76de0b0c7eb9de0f510f6a70670079c4.jpg

German team members Andrea Petkovic, Julia Georges, Anna-Lena Groenfeld, team captain Barbara Rittner and Angelique Kerber celebrate after defeating Australia 3-0 during their Fed Cup semifinals in Brisbane, Australia, Sunday, April 20, 2014. (AP Photo/Tertius Pickard)

68df18727e5ddc0f510f6a7067004ccb.jpg

Samantha Stosur of Australia plays a shot in her match against Angelique Kerber of Germany during the Fed Cup semifinals between Australia and Germany in Brisbane, Australia, Sunday, April 20, 2014. (AP Photo/Tertius Pickard)

74ada6e27e61dc0f510f6a7067000278.jpg

Angelique Kerber of Germany, left, and her team captain Barabara Rittner, right, talk between sets in her match against Samantha Stosur of Australia during the Fed Cup semifinals between Australia and Germany in Brisbane, Australia, Sunday, April 20, 2014. (AP Photo/Tertius Pickard)

0e9fcf4f7e59dc0f510f6a7067002a68.jpg

Angelique Kerber of Germany plays a shot in her match against Samantha Stosur of Australia during the Fed Cup semifinals between Australia and Germany in Brisbane, Australia, Sunday, April 20, 2014. (AP Photo/Tertius Pickard)

a9904fc6f82a800b4f0f6a7067003ab1.jpg

Serena Williams, of the United States, returns the ball to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)