I think it's like about ryoma and the seigaku members going to America o winbulton o 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 titolo is The Prince of Tennis: Eikoku-shiki Teikyū-jō Kessen!....It's about Seigaku and a familiar selection of Japan's other superiore, in alto junior tennis teams gather in Wimbledon, London, for a tennis tournament. During tennis practice, the Japanese players are suddenly attacked da 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.