Olympic swimming ends with a historic win: All you need to know

 Australia's Emma McKeon became the first female swimmer to win seven medals at a single Olympic Games, while American Caeleb Dressel powered to victory

Punishing heat greeted athletes in the Olympic Stadium on Sunday as tempers boiled over in the boxing ring when a disqualified Frenchman staged a sit-in.

Sun beating down on a fan-free Olympic stadium produced sweltering conditions. A trackside thermometer placed about 50 meters from the finish line touched 40 degrees Celsius.

Games organizers said 30 people, including volunteers and contractors, have suffered heat-stroke. All had mild symptoms.

A dramatic day of action before the gold medal boxing bouts featured a knock-out that won one happy Filipino a medal and a disqualification that resulted in a furious Frenchman refusing to budge from the ring.

French super heavyweight Mourad Aliev was disqualified for what the referee deemed an intentional headbutt — a call he protested with an hour-long ring-side sit-in.

The day turned out far better for Filipino middleweight Eumir Marcial, who knocked out Armenia's Arman Darchinyan with a right hook to cruise to the semi-final.