Name the sport played by these famous personalities

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Across
  1. 4. Roger Federer
  2. 5. Usain Bolt
  3. 6. Pele
  4. 7. Nadia Comaneci
  5. 9. Sir Steve Redgrave
  6. 10. Muhammad Ali
Down
  1. 1. Sachin Tendulkar
  2. 2. Michael Jordan
  3. 3. Michael Philips
  4. 8. Serena Williams