I think it's like about ryoma and the seigaku members going to America of winbulton of something like that. And seigaku, hyotei, shitenhouji, rikkaidai fuzoku, and higachu is there to compete against these other tennis players in a tournament I think.
The movie's titel is The Prince of Tennis: Eikoku-shiki Teikyū-jō Kessen!....It's about Seigaku and a familiar selection of Japan's other top, boven junior tennis teams gather in Wimbledon, London, for a tennis tournament. During tennis practice, the Japanese players are suddenly attacked door a violent "street tennis" group that calls themselves "Clack". An encounter with a former Clack member named Xiu leads Ryoma and his vrienden into a battle with Clack to confront its leader, Keith, and discover his reasons for having such a violent approach to tennis.