Triple world champion Koki Kameda showed an impressive physique while training on Thursday in Japan's capital. Koki (24-1, 15 KOs), the current world champion of the World Boxing Association (WBA), is preparing his first defense of the belt he won last December with a unanimous decision over Alexander Munoz of Venezuela. The champion, 24, boxed for four rounds and showed speed, precision and power in the scrimmage.

Koki will defend against against Daniel Diaz (18-2, 13 KOs) of Nicaragua, an American boxer who picked up 65% of his victories by knockout. Kameda vs Diaz happens on Saturday, May 7, at the Osaka Prefectural Gymnasium.