Japan female figure skating icon Mao Asada announced Monday on her blog that she is retiring.The 26-year-old, three-time world champion and silver medalist at the 2010 Vancouver Olympics, has been plagued by left-knee pain this season."I had the best performance and result during the world championship in the same season as the Sochi Olympics. Had I called it a day then, I might still have been hoping to return as a skater now," she wrote."There were many things I could only know by being a skater. After returning (to competition), I spent many times fretting about not being able to perform…READ FULL ARTICLE