Wright State University (WSU) and Northern Kentucky University (NKU) hold the most intense rivalry in the Horizon League, starting in 2015 when NKU joined the league. NKU and WSU have fought back and forth for years, taking turns earning Horizon League titles and going to the NCAA championships. This intense, long-term rivalry began in July of 2015 when it was announced that NKU would be joining the Horizon League.