I think it's like about ryoma and the seigaku members going to America ou winbulton ou 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 titre is The Prince of Tennis: Eikoku-shiki Teikyū-jō Kessen!....It's about Seigaku and a familiar selection of Japan's other haut, retour au début junior tennis teams gather in Wimbledon, London, for a tennis tournament. During tennis practice, the Japanese players are suddenly attacked par a violent "street tennis" group that calls themselves "Clack". An encounter with a former Clack member named Xiu leads Ryoma and his Friends into a battle with Clack to confront its leader, Keith, and discover his reasons for having such a violent approach to tennis.