Fiji, Britain into semifinals, Argentina upsets South Africa

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)

Argentina's team huddles up after winning their men's rugby sevens match against South Korea at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)

Danny Barrett of the United States, right, and teammate Matai Leuta walk off the pitch after the U.S. lost their men's rugby sevens match against South Africa, at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)

Fiji players huddle up at the start of their men's rugby sevens quarterfinal match against Australia, at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)

CORRECTS NAME TO HENRY HUTCHISON FROM NICK MALOUF - Australia's Henry Hutchison clings to the ball under pressure from New Zealand's Amanaki Nicole, left, and Scott Curry, right, in their men's rugby sevens match at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)

Britain's Dan Norton kneels before their men's rugby sevens quarterfinal match against the U.S. at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Shuji Kajiyama)

Argentina's Matias Osadczuk celebrates after Argentina defeated 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)

Perry Baker of the United States scores a try as Britain's Dan Bibby, left, and Ethan Waddleton look on, in their men's rugby sevens quarterfinal match at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)

South Africa's team huddles up at halftime in their men's rugby sevens match against the United States, at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)

Madison Hughes, left, of the United States and teammate Matai Leuta react after the U.S. team lost to Britain in their men's rugby sevens quarterfinal match at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo/Shuji Kajiyama)

Britain's Alex Davis scores a try as Brett Thompson of the United States looks on, in their men's rugby sevens quarterfinal match at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)

New Zealand's Scott Curry is lifted by teammates to catch the ball on a lineout, in their men's rugby sevens quarterfinal match against Canada at the 2020 Summer Olympics, Tuesday, July 27, 2021 in Tokyo, Japan. (AP Photo/Shuji Kajiyama)