From 2012 to 2015, the two teams competed in the I-40 Cup Series, a season-long, 16-game promotional series between the clubs. Whichever of the two won the most games played between them was declared the winner and got to keep the trophy cup until the next season. The losing team donated game tickets to a charity selected by the winner. The Sounds won the inaugural 2012 contest (9–7), and Memphis won the 2013 series (7–9). The teams tied the 2014 and 2015 series (both 8–8), but the Redbirds retained the title in both instances. After 2015, the teams discontinued the trophy cup, friendly wager, and promotional references to the Series.