The rules do not allow players to participate in polo left-handed. The original ban took effect in the 1930s because of safety concerns. Following World War II, the United States Polo Association lifted the ban but then reinstated it in 1974.
When left-handed players participate in polo, they tend to run head on into the right-handed players. This is because their polo sticks are on the same side as the right-handed players when they face each other. The result is an unpredictable game that could lead to injuries.
While left-handed people can still participate in the sport, they must hold the mallet in their right hands to ensure that they do not become a safety concern.