Court two (C) and Center Court (R) at the Rio 2016 Olympic Games Tennis events at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 06 August 2016. EPA/MICHAEL REYNOLDS

Fans wrapped in the Brazilian flag as they watch Agnieszka Radwanska of Poland play Saisai Zheng of China during their women’s singles match of the Rio 2016 Olympic Games Tennis events at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 06 August 2016. EPA/MICHAEL REYNOLDS

Saisai Zheng of China hits a return to Agnieszka Radwanska of Poland during their women’s singles match of the Rio 2016 Olympic Games Tennis events at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 06 August 2016. EPA/MICHAEL REYNOLDS

Kei Nishikori of Japan in action against Albert Ramos-Vinolas of Spain during the men’s singles match of the Rio 2016 Olympic Games Tennis events at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 06 August 2016. EPA/MICHAEL REYNOLDS

Timea Bacsinszky of Switzerland in action against Shuai Zhang of China during the women’s singles match of the Rio 2016 Olympic Games Tennis events at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 06 August 2016. EPA/LAURENT GILLIERON