PHOENIX, AZ - AUGUST 17: Olympic tennis player Bethanie Mattek-Sands of the United States throws out the ceremonial first pitch to prior the MLB game between the New York Mets and Arizona Diamondbacks at Chase Field on August 17, 2016 in Phoenix, Arizona. Mattek-Sands won gold in mixed doubles at the 2016 Rio Olympic games. (Photo by Jennifer Stewart/Getty Images)