ja この利用者は日本語母語としています。
en-3 This user is able to contribute with an advanced level of English.
nl-0 Deze gebruiker heeft geen kennis van het Nederlands, of begrijpt het met grote moeite.

I have been active in "sports interwiki" (mainly tennis and golf) with my IP addresses. However, they have changed so often...I decided to take a login name to identify myself. (I wasn't aware of your message; I've been confused with my anonymous changes.)

I started to write tennis articles in Japanese Wikipedia since November 2004; I wrote their Japanese Version myself.