Alison Riske-Amritraj Pictures
STANFORD, CA - JULY 22: Alison Riske of the United States looks on as her opponent CoCo Vandeweghe of the United States lays injured on the court during day five of the Bank of the West Classic at the Stanford University Taube Family Tennis Stadium on July 22, 2016 in Stanford, California. (Photo by Lachlan Cunningham/Getty Images)