Professional sumo wrestling takes place only in Japan, but its top practitioners are increasingly Mongolian, who have come to dominate the ancient sport.  Nearly 30 Mongolians has been wrestling in the Natsu Basho which has started in Tokyo on 14th of May. A total of eight sumo wrestlers are the sons of traditional Mongolian wrestling champions such as Hakuho Davaajargal, the son of Munkhbat, Byambadorj, the son of Davaanyam, and Dulguun, the son of Erkhbayar.