Partnerships The Commerce Casino & Hotel, home to the largest poker room in the world, has announced an exciting partnership with the richest, most prestigious and longest-running poker series – the World Series of Poker (WSOP). This collaboration signifies a pivotal moment for the poker community, bringing together two powerhouses to elevate the poker experience for players and fans worldwide. BetRivers, powered by Rush Street Interactive, a leading US-based online betting and gaming company, has announced its partnership as the title sponsor for the upcoming NASCAR Xfinity Series Dash 4 Cash race at Dover Motor Speedway. The BetRivers 200, set for Saturday, April 27, is being undertaken with the Delaware Lottery and marks the beginning of a thrilling new chapter in NASCAR history, as RSI commits to the long-term support of this top tier sporting event.