No Americans in top-10

Question

This week, for the first time since rankings began in 1973, there is no American among the world’s top-10 men’s players, with Andy Roddick dropping two places down to world No. 11.

So what does that say about the state of men's tennis in the USA. Find out at http://blogs.bettor.com/Ten-reasons-for-concern-about-American-tennis-a21189.