- Simone Biles stumbles on balance beam as attempts to win a record five gymnastics golds in a single Olympic Games go up in smoke, leaving her to settle for bronze.
- Poland's Anita Wlodarczyk sets a new world record in the hammer throw, storming to gold with an effort of 82.29 metres.
- Ruth Jebet takes 3000m steeplechase gold for Bahrain, but misses out on a world record time by slowing up towards the end of the race.
- Controversy in 10 kilometre swim as Aurelie Muller is stripped of silver medal for 'dunking' rival Rachele Bruni at the line. Sharon van Rouwendaal wins gold.
QUOTES OF THE DAY
"After the world record I felt an explosion of happiness," the record-breaking Wlodarczyk said. "It was my mum's birthday today so it is such a gift that she is here today."
"My goal is the world record. If you come out with that then you get the gold medal." - Christian Taylor lays down the gauntlet after needing just a single (hop, skip and a...) jump to reach the triple jump final.
"We try to really feel our characters so we saw some gypsy dances and we tried to take up their manner and movement, because we can't come up with that on our own." - Synchronised swimming queens Natalia Ishchenko and Svetlana Romashina get into character.
Great Britain kept their hold on second place in the medal table as Charlotte Dujardin took gold in the individual dressage, her country's 250th gold medal at summer Games.
David Rudisha will defend his 800m title, with a tough year behind him in which he has often been beaten. Allyson Felix headlines the women's 400m final, while medals are on offer in boxing, wrestling and the men's omnium cycling.
She insisted pre-Games that she had no thoughts of retirement but we may have seen the last of two-time Olympic champion over 200m Veronica Campbell-Brown after she failed to make it out of today's heats.