Yamada made history this year when she travelled to South Korea and beat Su Yun Hong for the WBO title becoming the youngest female Japanese champion, the first WBO female champion from Japan and the first Japanese female to win a world title in South Korea. It seemed, aged 19, that she was set for a huge future in the sport though with this retirement it looks like her plans have changed drastically and she has walked away from the sport without even making a defence of her world title.
From what we understand Yamada indicated her retirement back in May to the JBC. It was the JBC who made the announcement known earlier today though no reason has yet been given for the surprising move. In fact the only thing we know is that no injury caused the retirement.
We hope to get more details on this shock announcement soon though from we understand the details will never be fully released and instead Yamada will become one of the greatest "what if?" in boxing history.
(Image courtesy of Boxrec.com)