If you're asking about the #1 sport in the world, the answer is soccer AKA football (not American football). It's hard to imagine futbol as the #1 sport since it's not that popular in the US, but every country in the world is different. While the United States is mostly popular with Baseball and American football, there are countries in South America, Europe, Asia, and so many different continents where soccer is all they live and breathe. You will never see a "World Cup" for any other sport other than soccer.
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The number one athlete in the world is Michael Jordan. He is a basketball player in the U.S.A.
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