Laura Siegemund of Germany in action against Monica Puig of Puerto Rico during their Women’s singles quarter final match of the Rio 2016 Olympic Games Tennis events at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 11 August 2016. EPA/MICHAEL REYNOLDS

Fabio Fognini of Italy in action against Andy Murray of Great Britain during men’s singles third round match of the Rio 2016 Olympic Games Tennis events at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 11 August 2016. EPA/MICHAEL REYNOLDS

Spanish tennis player Rafael Nadal celebrates his victory against French Gilles Simon during their match of the Rio 2016 Olympic Game at the Olympic Tennis Center in Rio de Janeiro, Brazil, 11 August 2016. EPA/FERNANDO BIZERRA JR

Martina Hingis (R) and Timea Bacsinszky of Switzerland in action during the women’s quarter final doubles match against Hao-Ching Chan and Yung-Jan Chan of Chinese Taipei at the Rio 2016 Olympic Summer Games Tennis events in Rio de Janeiro, Brazil, 11 August 2016. EPA/PETER KLAUNZER

Monica Puig of Puerto Rico hits a return to Petra Kvitova of the Czech Republic during their Rio 2016 Olympic Games Women’s Singles match at the Olympic Tennis Centre in the Olympic Park in Rio de Janeiro, Brazil, 12 August 2016. EPA/MICHAEL REYNOLDS