"At the Olympics scouting future boxing champions."

Floyd Mayweather, ring legend who retired last year with a record of 49-0, posts his schedule on Twitter

"A Brazilian sailor has taken part in six Olympics. I have only competed three times, so I will not retire and will try to take part in future Games."

Xu Lijia, Chinese sailor, who was disqualified for three rounds in laser radial and failed to make the finals

"Thank you all. Your support and help have made me what I am now. Thank you."

Wang Zhen, Chinese race walker, after claiming the men's 20km gold, 15 seconds ahead of compatriot Cai Zelin

"Twelve straight losses during Olympic matches, with an average loss of 29.6 points. For eight years, not a single win. All you guys can show off are cool haircuts, model-like physiques and pretty girlfriends. Can you just win a single match?"

Mr-wang, a Sina Weibo user, comments on China's men's basketball team