Weak yen helps Nikkei rise a 10th day, its longest win streak in 27 years
* Nikkei's winning streak is longest since Feb 1988 * Nikkei has risen 5.0 pct over 10 days * Dollar's gain gathers pace on Suga's comment TOKYO, May 28 (Reuters) - Japan's Nikkei share average rose on Thursday, extending its gains to a 10th day as investors hoped exporters' earnings will rise after the dollar hit its highest against the yen since December 2002. The Nikkei 225 ended 0.4 percent higher to 20,551.46, a**ther 15-year high. If it manages to close above 20,833.21 in