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Ryoma Echizen is a fictional character and the protagonist of the manga and anime series The Prince of Tennis created by Takeshi Konomi. In the series, Ryoma is portrayed as a twelve year old tennis prodigy who won four consecutive Junior Tennis Tournaments in America. His father is Nanjiro Echizen, a former tennis pro nicknamed "Samurai Nanjiro". At his father's request, Ryoma returns to Japan in order to attend Seishun Academy ("Seigaku" for short), a private middle school famous for its strong tennis team. 

Source from Wikipeida