Camden Yards is in walking distance from most of the 3* hotels in the Inner Harbor zone - including the big four - Wyndham, Lord Baltimore, Holiday Inn, and Marriott. A couple other 3* and all of the 4* are more than 1/2 mile from the park, but still a short cab ride. The only hotel I can think of in the "Stadiums" zone - a converted Best Western - is further from Camden Yards than the above-named 3* in the Inner Harbor zone. Also consider bidding in the BWI Airport zone, where there is a ton of inventory, a convenient light rail to the stadium, and amenties like free parking and free internet (in the 2.5* properties) that you don't get in downtown. I usually prefer to stay at a BWI 2.5* than an Inner Harbor 3* whenever I will need to park a car. Enjoy the game!