For another, Masato is only seven years old and doesn't know how to tie his own loincloth.

CNN: Wrestle Mania

Masato Uchishiba, the 2000 world student champion, clinched gold for Japan, defeating Slovakia's Jozef Krnac for knockout "ippon" finish in the under-66kg final.

CNN: Thai gold as Asian athletes excel

But Masato and the eight other boys who crowd onto the swept-earth ring at Moriyama elementary school in central Japan may be sumo's best hope.

CNN: Wrestle Mania

Then Masato Sukeda and the other boys clambered into the ring.

CNN: Wrestle Mania

Masato sukeda is an unlikely poster boy for sumo.

CNN: Wrestle Mania