Diamond Stadium

Diamond Stadium is a baseball stadium which serves as the setting of the Sonic X episode "Unfair Ball". The field is owned by Elmer Johnson who wanted to build an indoors stadium, resulting in demolishing Diamond Stadium. The stadium is well-known for its beautiful turf.

History
Diamond Stadium is the former playing grounds of the Diamond baseball team that is seemingly abandoned for around thirty years. During this time though, the groundskeeper, Albert Butler has been maintaining the field. Miles "Tails" Prower first visits the stadium, meeting Albert and learning about the stadium's history and sadly, Albert tells Tails that the stadium is going to be demolished due to Elmer Johnson wanting to build an indoors stadium. Albert then shows his Chaos Emerald to Tails who also possess a Chaos Emerald. Due to their close proximity, a bright light is emitted from the Chaos Emeralds and shoots straight into the sky, bringing everyone's attention, including Dr. Eggman and Sonicand his friends.

Dr. Eggman arrives at Diamond Stadium in an attempt to snatch the two Chaos Emeralds from Albert and Tails but Knuckles, Sonic and his friends managed to keep one safe. Dr. Eggman challenges Sonic and his friends to a winner-takes-all baseball game in an attempt to claim both Chaos Emeralds using a team of several E-21 Ballios robots. Initially, Eggman's team weren't playing fair but Sonic's team eventually caught up. Throughout the game, the stadium is suddenly filled with citizens. Sonic's team won 37-36 and Dr. Eggman escapes with the Chaos Emerald along with his Ballios robots.

As the crowd cheers wildly for the victory of Sonic's team, Elmer Johnson appears who thanks Albert for his hard work and dedication to the stadium. The fate of Diamond Stadium differs between the Japanese and English versions of the episode; in the English version, Elmer Johnson decides to take the turf out of Diamond Stadium and put it in a new stadium requiring Albert's help, while in the Japanese version, he commits the stadium itself to Albert's care.

It was also the location of the Emerald Fighting Tournament, a martial arts competition, during the episodes "Prize Fight" and "A Wild Win". In these episodes, the stadium has been converted from a baseball field and now features a raised arena in the middle.