Gre-Nal is the nickname for matches between the two main forces of southern Brazilian football, Grêmio and Internacional. The two clubs are based in the same city – Porto Alegre, the capital of the southern state of Rio Grande do Sul. History The Gre-Nal is perhaps the fiercest and one of the most mystic football rivalries in South America, leading to extremely high levels of emotion, competition and occasional violence. It has been the canvas of some of the greatest Brazilia… (More on Gre-nal)