Because it isnt about winning really in american sports. it is about selling the out of the merchandise. IT is about at ude, and chest thumping, and how many bentleys you drive and how big of rims can you fit on them. If you are model quality young guy, with a bentley and 45" rims with plutonium teeth, you are a superstar, and of course assumed you are good at what you do.
you go out there and play against the in grinders of the world, the ghana's, and the eastern euro's who basically lived off of soccer their whole lives, who slept using a damn soccer ball as a pillow...a soccer ball that their family saved up 3 months salary to buy...these guys got nothing to hide, so they rely solely on their skills to get it done. They have the drive and hunger that most amercan athletes have kind of lost...if an american athlete is not going to make 5 brazillion dollars for bending his leg....he'd rather not be bothered...bring on the rims es!
thats why i think america is often exposed on the world stage in most sports.