Obviously, everybody that matters likes the new challenge system
currently being implemented at the US Open. A player is allowed to
challenge a judges call, and the point is reviewed via big-screen,
the ball having been tracked and recorded by high-technology
cameras. If the challenging player is correct, he (or she) doesn't
lose the right to challenge again. The players like it. The judges
like it. The paying fans like it. It's a winner all the way around.
Great going IMO, it's a pleasure to see modern technology put to
such good use.