One of the most prestigious trophies in sports history, the America’s Cup—also known as the Auld Mug—is awarded to the winner of match races between sailing yachts. With origins dating back to 1851, it’s the oldest international sports trophy in modern history. For over a century, there were only two competing yachts in total: the “defender” (i.e. the defending champion) and the “challenger.” In 1970, multiple challengers competed for the first time and have done so ever since.