Austria's Anna Kiesenhofer

Shock golds for Kiesenhofer & Hafnaoui as Osaka & Biles start campaigns

There were also upsets in the tennis, with Wimbledon champion Ashleigh Barty knocked out, and the taekwondo where Britain's two-time champion Jade Jones lost in the first round.

Even favourite Simone Biles was wobbly in gymnastics qualifying, while golf was robbed of two leading players through positive Covid-19 tests and defending tennis champion Andy Murray pulled out of the men's singles.

And in basketball, the USA had their 25-game winning streak at the Olympics ended by an 81-76 loss to France in their opening game.