The tennis courts that I currently use for group and private lessons and are listed below.  

Nishitokyo  (西東京)

Chuo-ku (中央区)

Kichijoji (吉祥寺)

Oizumi Gakuen  (大泉学園)

Shibuya (渋谷)

Tanashi (田無)

Kawagoe (川越)

Ariake (有明)

Oi (大井)