Nikkei rises for 10th day as weak yen lifts exporters

* Nikkei's winning streak longest in 27 years * Fuji Heavy hits record high on weak yen, U.S. econ optimism By Ayai Tomisawa TOKYO, May 28 (Reuters) - Japan's Nikkei share average rose on Thursday morning, extending its gains to a 10th day as investors hoped exporters' earnings will rise after the dollar hit eight-year highs against the yen. The Nikkei 225 rose 0.7 percent to 20,620.59 in midmorning trade after climbing as high as 20,632.31, the highest since April 2000. If it m