Deck tennis
Deck tennis is a sport that is played by mariners on the decks of both cargo and passenger vessels. The sport is a hybrid between tennis and quoits, and is played with either the rubber disk or ring, or a similarly-sized rope ring. The sport has been standardized and formalized in several countries under names such as "tennikoit" or "ring tennis".
American sources from the 1930s and 1940s attribute the origin, or at least formal establishment of the game, to Cleve F. Schaffer. In 1981, Mariano Herrera and Alejandro Nougues from Argentina won the first and only Deck Tennis World Championship celebrated on the beach in Punta del Este, Uruguay.