kendo is not popular in any country
Yes.
The second most popular sport in Australia is cricket.
kendo
Swimming is easily the most popular water sport in Australia.
Kendo
Tennis is popular in Australia because it has always been the most popular sport in Australia since it was introduced in 1870's. It is a great spectator sport.
In Australia the 3rd most popular sport is ultimate frisbee. it is behind soccer and rugby
the sword style of kendo
Swimming
baseball
Sumo wrestlings would be a popular Japanese sport though that popularity has been on a decline. Judo, Kendo and Karate may also count though they double as a martial arts.