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In a tennis match, the ball boys pick up any balls that go into the net or off the court and throw them back to the players. In a baseball game, the ball boys are in charge of collecting the balls that are hit out of the field. 球童
But TV replays showed that in taking a quick throw-in, Rees had used a different ball - handed to him by a ball-boy - to the one that Jonny Sexton had sliced into touch, which is against rugby's Law 19.2.
The ball was handled by spectators, which should have denied Wales the right to take a quick throw-in, but Wales captain Matthew Rees was handed a different ball by a ball-boy and passed in to Mike Phillips peeling round the blind side.