Ace of Diamond (ダイヤの, A Daiya no A [Daiya no Ēsu], also known as Diamond no Ace) is a shōnen baseball manga written and illustrated by Yuji Terajima and published by Kodansha. It has been serialized by Weekly Shōnen Magazine since 2006. In 2008, Ace of Diamond received the Shogakukan Manga Awards for the shōnen category. In 2010, it won the Kodansha Manga Award for best shōnen manga. An anime adaptation was premiered on October 6, 2013.
The story follows Eijun Sawamura, a pitcher who joins an elite school with a brilliant catcher named Kazuya Miyuki. Together with the rest of the team, they strive for Japan's storied Koushien championships through hard work and determination.