MILAN, Feb 15 : Japan's Kaori Sakamoto faces a trio of rising Americans and a little-known but potentially dangerous Russian teenager when the women's Olympic singles figure skating event starts on Tuesday. After an all-time upset in men's singles and a controversial result in ice dance, fans will be brace for the unexpected again when the women's competition with no clear favourite closes out the figure skating events at the Milano Ice Skating Arena.  One sure thing is that there a new