I guess it takes the designer to explain, but it's the altitude that's affecting the unpredictable movement on the ball, not the ball itself. Defending himself, he says the ball's been around since December and no one's complained until now. I know it's a problem in Jo'Burg and Nelspruit (highest venue in WC history). But Cape Town's at sea level, does anyone know if the problem exists there?
Furthermore, Dr. Harland's arguments are all fine and good, but why not develop a ball specifically for high altitude play?
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