Michael Phelps of the US prepares for the 4 x 100m freestyle relay final on Sunday. Stefan Wermuth / Reuters

Simone Biles of the US grimaces during her gymnastics training session on the weekend.Damir Sagolj / Reuters

Anna van der Breggen of the Netherlands celebrates winning gold in the cycling road race on Sunday. Matthew Childs / Reuters

You Hao of China competes during the qualification round for artistic gymnastics on Sunday. Damir Sagolj / Reuters

Fabio Basile of Italy celebrates his gold medal in the 66kg judo final on Sunday. Toru Hanai / Reuters

Chang Hye-jin of South Korea takes aim during Sunday's quarterfinal of the team archery competition. Yves Herman / Reuters

Venus Williams of the US reacts during her loss to Belgium's Kirsten Flip-kens in Saturday's opening round of tennis. Kevin Lamarque / Reuters

Flavia Saraiva of Brazil shows off lipstick on her cheek during Sunday's artistic gymnastics qualifications. Mike Blake / Reuters

Ignacio Perrin of Argentina takes a punch during his lightweight boxing loss to Thailand's Amnat Ruenroeng on Sunday. Peter Cziborra / Reuters