The most popular sports in Japan when I was young, was basketball and soccer. I used to live there and I played for Nagasaki in both sports :)
Yes, it is one of the most popular sports in Japan.
Sumo and American baseball is really popular.
In Australia, cricket. In Japan, karate.
soccer of course...
A good example is baseball. baseball is one of the most popular sports of japan since its introduction in 1872.
Judo, Sumo, and Baseball.
sumo wrestling and baseball
BMX, Skateboarding and Surfing
sumo wrestling and baseball
Baseball, soccer, sumo, kendo, judo and other martial arts are popular sports in Japan.
Different sports are popular in different countries. (Eg. Badminton in Japan, Basketball in USA, Rowing in Great Britian.) But Athletics is a sport popular in most countries.