Santiago Alvarez
Argentina players, including Argentina's Santiago Mare, right, embrace as they celebrate defeating South Africa in their men's rugby sevens quarterfinal match at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)
Fiji, Britain into semifinals, Argentina upsets South Africa

By John Pye Jul. 26, 2021 11:46 PM EDT