Ariake Coliseum (有明コロシアム, Ariake Koroshiamu) is an indoor sporting arena in Ariake Tennis Forest Park (有明テニスの森公園, Ariake Tenisu no Mori Kōen) located in Ariake, Kōtō, Tokyo, Japan. It has a capacity of 10,000. The arena is used as the center court for the Japan Open Tennis Championships and the Toray Pan Pacific Open held in Ariake Tennis Forest Park. It is one of the few professional tennis venues which has a retractable roof.The venue will host tennis events at the 2020 Summer Olympics.