Sports betting is also legal in Delaware, although our neighbor is in a similar situation only retail wagers are allowed at one of Delaware’s three racinos. TwinSpires Sportsbook at Ocean Downs Casino Address and Hoursīerlin sits 100 miles southeast of Baltimore near the Delaware border, with Salisbury being the closest “big” Maryland city. What can Maryland bettors expect from the Churchill Downs-owned casino and sportsbook? Here’s a taste of what you’ll find when you visit. While the retail sportsbook is relatively new, Ocean Downs Casino has been around (to varying degrees of success) since 1947. 17, 2021, as the fourth retail sportsbook in Maryland. TwinSpires Sportsbook at Ocean Downs Casino in Berlin officially opened on Dec.