American veteran Allyson Felix will hang up her spikes having sealed a remarkable 19th world medal on Friday, while Fred Kerley laid down an impressive marker in the heats for the 100m in Oregon.

From the dizzying gymnastics heights of African-American Simone Biles to Indian wrestler Sakshi Malik and Brazilian golden girl Rafaela Silva in judo -- Rio proves a groundbreaking Games for women.

Allyson Felix clinches a record sixth career Olympic gold as the United States win the 4x400m relay for a sixth straight Games.

Allyson Felix becomes the first woman athlete with five gold medals as she powers the US sprint relay team to victory.