Yesterday during my hitting session, one of the players in the next court hit one of his ball into mine. He said "hey, can you hand me my ball please...thanks." As i was walking through the piles of tennis balls, he said "its the Porno Ball" Not understanding what he meant, i saw a ball that didnt have a wilson logo on it. Instead, it has three X's on it, and at that point i knew that it was his "Porno" Ball. What manufacture creates this ball with three X's? It didnt have any company on it...I've also saw balls with One X, and Two X's as well. Any feedback? Thanks.