Hitting a wrong ball costs you two strokes
In stroke play, playing a ball that belongs to another player in your group earns an automatic two-stroke penalty, and you must still go back and finish the hole with your own ball.
The other player’s ball must be replaced, not dropped
Unlike many relief situations in golf, the ball that was wrongly played must be placed back on its original spot — or an estimated spot if the exact position is unknown.
Marking your ball is your best protection
While the rules don’t require a unique identification mark, adding one to your ball is a simple habit that significantly reduces the risk of ever hitting the wrong ball.
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