Unless you've been living under a rock, you know the biggest celebrity arguably in the history of world sport is about to take his act to the U.S. When David Beckham takes the field at the Home Depot Center on July 21, it will mark the moment Major League Soccer officially lands in the mainstream sporting consciousness of America. But Becks (and his Spice Girl wife) isn't the first foreign megastar to arrive on these shores amid enormous hype. Keep reading for the biggest overseas sensations in the history of American sports.