Jonathan Paul Koppenhaver's attack on Christy Mack left her with broken ribs and a broken nose.
Wrestler Tarek Abdul Salam wins a gold for Bulgaria, disappointing fans in Egypt, where he was born.
Three more athletes are stripped of their Olympic medals after failing retests of their Beijing 2008 and London 2012 doping samples.
British wrestler Chinu Sandhu, who won Commonwealth bronze in 2014, is banned for four years after failing a drugs test.
Audio & Video
World of Sport brings wrestling back to terrestrial TV screens for the first big series since 1985.