It's the ultimate extension of the big fishasmall pool theory. How do you become one of the top 1000 court tennis players in the world? By picking up one of the lopsided wooden rackets and hitting one of the rock-hard, hand-stitched balls. According to educated estimates, there are maybe 500 players of this funky, old game worldwide. But don't worry about the sport going the way of the passenger pigeon: Henry VIII was playing during the beheading of Anne Boleyn. Manhattan's very private Racquet and Tennis Club houses two of about 30 U.S. courts, and most of the others are within driving distance.