The business of pro tennis

the exchange. The US Open now in the quarterfinals section. And while this year's showing has not been a grand slam for American tennis players, tennis's popularity is still growing overall stateside.Joining me now to break it all down with those numbers included from the Billy Jean King Tennis Center in Queens, New York, is CNBC's Alex Sherman. Uh this is a plum assignment even though it's local, but there's a lot of folks out there who would be very, very, very happy to be where you are right now, Alex. Y ...