The LNFF SimCup I, more commonly known as Nations Cup I, is a football tournament held in Jiesan and hosted by the League of Nations Football Federation and it is the first championship tournament held by the organization. Jiesan was chosen to host the event as it had proposed and founded the LNFF and the tournament itself.
The knockout stage was a single-elimination tournament involving the eight teams that qualified from the group stage of the tournament. There were three rounds of matches, with each round eliminating half of the teams entering that round. The successive rounds were: Quarter-finals, Semi-finals, Final. There was also a play-off to decide third/fourth place. For each game in the knockout stage, a draw was followed by thirty minutes of extra time (two fifteen minute halves); if scores were still level there would be a penalty shootout (at least five penalties each, and more if necessary) to determine who progressed to the next round. Scores after extra time are indicated by (AET), and penalty shoot outs are indicated by (PSO).