Sports Legends of the '70s

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Across
  1. 1. Quarterback who led the Pittsburgh Steelers to four Super Bowl victories.
  2. 3. Tennis player who dominated the sport in the '70s.
  3. 6. Brazilian soccer legend.
  4. 8. Triple Crown-winning racehorse.
  5. 10. Boxer who had epic bouts with Muhammad Ali.
  6. 11. Heavyweight boxer who famously fought Muhammad Ali.
  7. 12. Boxer known as "The Greatest."
  8. 13. Hockey's all-time leading scorer.
  9. 14. Golf legend with 18 major championships.
Down
  1. 2. NBA's all-time leading scorer.
  2. 4. Legendary center for the Boston Celtics.
  3. 5. Hockey defenseman known for his offensive prowess.
  4. 7. Quarterback known for guaranteeing a Super Bowl victory.
  5. 9. Baseball's all-time hits leader.
  6. 12. Baseball home run king before Barry Bonds.