Over the last 12 months Piero Maza has refereed 17 games, comprising 3 World Cup Qualifying - South America games, 6 Copa Libertadores games, 5 Copa Sudamericana games and 3 Copa America games. In addition he has been the Fourth Official 10 times.
During this period he has issued 0 yellow card at a rate of 0 per game and 0 red card at a rate of 0 per game.
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