Christiane Amanpour talks to director Ken Burns about his new documentary series "Muhammad Ali" on the legendary boxer, what he found so compelling about him, and sportsmanship today. John McEnroe, 7-time tennis Grand Slam champion, discusses the whirlwind success of British tennis star Emma Raducanu and the role mental health plays in the game. Hari Sreenivasan talks to Dave Zirin, author of "The Kaepernick Effect", about the waves footballer Colin Kaepernick made in the sporting world when he took at knee in 2016.
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