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Dave Zirin, sports editor for The Nation magazine, says protests highlighting racial and economic injustice are expected from athletes attending the 2016 Olympics in Brazil, such as tennis champion Serena Williams and players from the NBA, WNBA and other countries.

Polls show more than 60 percent of Brazilians think hosting the Games will hurt their country. He says that ahead of today’s opening ceremony, residents of heavily policed and displaced neighborhoods plan a major march to Rio’s “Olympic City.”