Beyblade S01E07 - Thirteen Candles

Tyson, Max and Kenny are working on Dragoon to ensure victory in the finals when Grandpa interrupts and reveals Tyson that it is his 13th birthday! After the party, the first round ends quickly, with Tyson unexpectedly defeating Kai. Kai then goes harder on Tyson and easily defeats him in the second round. The third round is explosive, with Tyson just managing to defeat Kai, and become the National Beyblade Champion. Mr. Dickinson then reveals to Tyson, Kai, Max, Kenny and Rei that they will become a team and participate in the World Championships.