Though fears of an outbreak of the mosquito-borne Zika virus proved unfounded, Rio's swimming pools had problems staying blue -- turning green on different occasions and puzzling organizers who had to drain the pools and refill them.
The drug issue led to a war of words between U.S. swimmer Lilly King (right) and two-time doping transgressor Yulia Efimova of Russia. King said after beating Efimova in a race that she should not have been allowed to compete in Rio.
The spirit of good sportsmanship shone brightly when American runner Abbey D'Agostino (right) and her 5,000-meter-race competitor Nikki Hamblin, of New Zealand, collided and fell to the track. Instead of jumping up and continuing to race, D'Agostino stopped to help Hamblin get up. Later in the race, when the injured D'Agostino was struggling to run, Hamblin stopped and assisted her.
Things got ugly and rather comical when two Mongolian wrestling coaches stripped off their clothes to protest a referee's decision to penalize Mandakhnaran Ganzorig as he celebrated a sure victory late in his match against Uzbek wrestler Ikhtiyor Navruzov. The Uzbek ended up winning when the Mongolian team lost its appeal, giving Navruzov an additional point.