BIG and HNTB have just won the competition to design an Athletics ballpark in Las Vegas. Nestled between Tropicana Avenue and Reno Avenue on Las Vegas Boulevard, the ballpark boasts 33,000 seats in an open-air stadium sprawling across nine acres. The focal point of the architectural concept for the new ballpark is a distinctive roof, inspired by five interlocking shells that resemble baseball pennants and honor the cherished game. These arched constructions provide players with shade from the sun while also letting in soft natural light from north-facing clerestory windows.