Japanese breaststroker Kosuke Kitajima on Monday vowed to bring home the gold from the Athens Olympics as the Japan Swimming Federation unveiled a 20-strong team for this summer's Games.

Kitajima, the world champion and world record holder in the 100- and 200-meter breaststroke, finished fourth in the 100 meters on his international debut four years ago in Sydney Olympics but heads to Greece as Japan's best gold medal hope in the pool.

"The Olympics in Sydney was my first international event but a lot has changed since then. Winning the gold is a dream of mine and I intend to realize that dream in Athens," the 21-year-old Kitajima told reporters in Tokyo.