In this article interactions between rivalry and jealousy are examined. Sport is a very rich medium where we can observe jealousy and rivalry objectively. Firstly there is an elaboration of what can represent sport through this perspective. Then there is an exploration of how competition, jealousy and envy affect ways of rivalry, shows that rivalry and identification are very close to jealousy, as it is to envy. Rivalry is shaped through the relations of the siblings in regard to their mother, at the Oedipal period. At the last part, the article focuses on situations that can inhibit rivalry and can affect negatively identifications, which are all important for psychic development.