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RIO DE JANEIRO, BRAZIL - AUGUST 06: Kirsten Flipkens of Belgium in action against Venus Williams of USA in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Julian Finney/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Kirsten Flipkens of Belgium in action against Venus Williams of USA in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil.  (Photo by Julian Finney/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 06: Kirsten Flipkens of Belgium in action against Venus Williams of USA in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Julian Finney/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Kirsten Flipkens of Belgium in action against Venus Williams of USA in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil.  (Photo by Julian Finney/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 06: Venus Williams of USA in action against Kirsten Flipkens of Belgium in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Julian Finney/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Venus Williams of USA in action against Kirsten Flipkens of Belgium in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil.  (Photo by Julian Finney/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 06: Venus Williams of USA in action against Kirsten Flipkens of Belgium in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Julian Finney/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Venus Williams of USA in action against Kirsten Flipkens of Belgium in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil.  (Photo by Julian Finney/Getty Images)

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RIO DE JANEIRO, BRAZIL - AUGUST 06: Venus Williams of USA in action against Kirsten Flipkens of Belgium in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil. (Photo by Julian Finney/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 06:  Venus Williams of USA in action against Kirsten Flipkens of Belgium in the women's first round on Day 1 of the Rio 2016 Olympic Games at the Olympic Tennis Centre on August 6, 2016 in Rio de Janeiro, Brazil.  (Photo by Julian Finney/Getty Images)