TOKYO, July 4 : Japan secured an emphatic win against Italy in front of a sold-out crowd in Tokyo on Saturday evening to kick off their Nations Championship challenge.The Brave Blossoms scored three tries to the Italians' one and threatened until the final whistle to finish 27-10 in a marked improvement on their recent run of form in international rugby.The Azzurri's string of unforced errors hampered any capacity to build momentum and belied the quality that saw them topple England and Scotland at the Six Nations earlier this year.Italy opened the scoring in the fifth minute when an angled run from outside centre Juan Ignacio Brex pierced the Japanese back line but Japan fought back six minutes later with towering skipper Warner Dearns forcing his way over the try line after a few phases