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STANFORD, CA - AUGUST 5: Maria Sanchez of the United States plays in her doubles match with Raquel Kops-Jones of the United States against Mona Barthel and Sabine Lisicki of Germany during day three of the Bank of the West Classic at the Stanford University Taube Family Tennis Stadium on August 5, 2015 in Stanford, California. (Photo by Lachlan Cunningham/Getty Images)

STANFORD, CA - AUGUST 5: Maria Sanchez of the United States plays in her doubles match with Raquel Kops-Jones of the United States against Mona Barthel and Sabine Lisicki of Germany during day three of the Bank of the West Classic at the Stanford University Taube Family Tennis Stadium on August 5, 2015 in Stanford, California. (Photo by Lachlan Cunningham/Getty Images)