Major League Baseball hopes the showdown between the New York Yankees and the Boston Red Sox at the London Stadium can help capture a whole new set of fans.
West Ham's home ground has been transformed into a 60,000-seater ballpark for two matches between the fierce rivals on June 29 and 30.
The MLB London Series 2019 will be the first regular season games played in Europe, and at a venue which took centre stage for the Olympics six years ago.