Dan Doh!!

They both compete in competitions and has a rival they want to beat. During the competitions they both end up meeting new friends that support them. 

Both title's are sport related ... while Dan Doh is about golf, Prince of Tennis well you guess ;) In both animes the main characters are gifted in that sport that they play, and they geting better and better, we can say they are prodigy's. Other than that they use various super powers while thay play, and also calling their attacks like "bullet dragon" and "cyclone smash" etc ... But as they play in tournament's they make friends and rivals, who helps them later on. 

Both anime are about people aspiring to be a pro golfers..anime about thr sport of golf .. 

Charasmatic main character = great anime. Both great sport animes...must watch!