This is a list of the most popular NCAA Division I college football series. With 155 games, the Lehigh-Lafayette rivalry, dubbed "The Rivalry," is the most played in Division I. The Mountain West Conference has the second most played with 139 games while the Mid-American Conference leads all leagues with 144 games. Each year since 1990, some members of one team have refused to play against their rivals. Known as "non-conference games", these contests are typically scheduled when there is no conflict with another conference game. In this case, either school can be at a disadvantage because they cannot use their preferred scheduling strategy (i.e., rotating non-conference games). There have been many cases where one team has refused to play until later in the season. Most recently, this occurred in 2017 when then-no. 1 USC refused to play Oregon until after Thanksgiving for what the Ducks called "the world's greatest game". The two teams finally met on November 24th in Los Angeles with USC winning 42-14. USC and Oregon were not the only ones to skip their annual meeting. In fact, no Pacific-12 team will ever again meet up with an Oregon opponent until 2037 at the earliest.