Nikkei extends gains to 9th day, limited by Wall Street's rate hike nerves

* Market assesses pros and cons of weak yen - traders * Nikkei posts longest winning streak since last August By Ayai Tomisawa TOKYO, May 27 (Reuters) - Japan's Nikkei share average was marginally higher on Wednesday morning, extending its gains into a ninth day, but gains were limited as U.S. shares languished after upbeat U.S. data fed fears that a rate hike may come earlier than expected. The Nikkei 225 rose 0.1 percent to 20,453.65 in midmorning trade after traversing negati