I have Manchester in IBA D3 Heartland Conference. It was my first team, and I have been there 9 years. I started playing Mary Hardin-Baylor not soon after, some time in late 2006 or early 2007. Magicdreamer has been there since season 1. Magic and I will be playing our 61st game in the series this season. That is a run of 8 years. He leads the series 33-27.
Are there any other long running Non-Con rivalries like ours?