The Kings' Cup was a rivalry between Lou City and Saint Louis FC, members of the USL Championship.

Their second match a month and a half later in St. Louis cemented the rivalry status with a 3–3 shootout that included eight yellow cards.

Due to financial challenges stemming from the COVID-19 pandemic and the upcoming creation of St. Louis City SC in Major League Soccer, STLFC folded after the 2020 season.

A renewal of the rivalry has occurred, starting in 2022 when St Louis City SC's reserve team began play with the Division 3 league MLS Next Pro.

Lou City win STLFC win Draw There have been a total of 16 competitive games (including 1 playoff match not counted toward the Kings' Cup points system) and 1 friendly between Louisville City FC and Saint Louis FC.