We have most clubs in the Italian Serie A. Napoli, Inter Milan, AC Milan, and Juve are some of the top clubs. However, when it comes to picking the most popular rivalries, which one would you go for?
This is a good question and the answer is straightforward. The main rival in Italian Serie A is between Inter Milan and AC Milan. It's even funny that both team originated from the same city, and they use the same stadium. Their matches are always very competitive.
Inter Milan rivalry with AC Milan is too competitive and serious. The competition equally involves the supporters. In almost every game, there must be fighting between the supporters. The rivalry reached to the extent that the city council have to provide extra security. But also, their match use to have full capacity to the extent that the tickets are sold out three weeks before the match.