I get the feeling that when players make statements like this, theres always some kind of back story thats being left out.
I doubt Joyce played Rios more than he played Agassi and Sampras, but I bet he went into the matches with those guys expecting perfection and merely got both playing at their average, yet great level. And then maybe when he played Rios, Rios was playing out of his mind every time.
Similar to how Sampras was so impressed by Brugera.
48÷2(9+3) = 288