Pac 12 does in both mbb and wbb. Everybody is paired up with their nearby or instate rival (UO/OreSt, USC/UCLA, Stan/Cal, etc, with the exception of Colorado and Utah). Each week a pair will travel and play both in another pair in 3 days so they only have to make one trip (e.g., Cal @ USC and Stan @ UCLA tonight, Cal @ UCLA and Stan @ USC on Saturday). But one weekend during the season the two rivals will play each other back to back. Although Covid postponements have altered it somewhat this year.