Australia's Ariarne Timus upsets USA's Katie Ledecky to win Olympic gold in 400m freestyle.
Defending Champions team USA was defeated by team France lead by Evan Fournier
in men's opener.
Top-ranked tennis star Ash Barty has been upset by 48-th ranked Spain's Sara Sorribes in the first round.
Table Tennis powerhouse China was defeated by host nation Japan to clinch the gold medal.
Austria's Anna Kiesenhofer wins shock cycling gold, defeating favorites.