For Japan head coach Eddie Jones, Saturday's Asia Rugby Championship encounter with Hong Kong in Tokyo is one more building block in his preparations for the World Cup in September. "All these games are stepping stones to the World Cup and hopefully we can keep improving so we reach our peak on September 19," said Jones. The Australian described Japan's opening 56-30 victory over South Korea a fortnight ago in Incheon as "rusty" and "sloppy" and will be looking for a marked improvement from the Brave Blossoms, who have not lost to Hong Kong since 1998 when the Pac Rim competition was contested. Japan have been unbeaten in the past seven years of the Asian Five Nations and are expected to whisk away the revamped three-team championship, played on a home-and-away basis. "We are not looking at Hong Kong specifically," Jones said. "It is all about wanting to play good rugby and we have picked our best 23 for that. We know Hong Kong will do everything they can to slow the game down. "But it is about what we want to do. There are certain tactical variations we want to try looking at towards the World Cup." Japan have made two changes with wing Akihito Yamada and flanker Tsuyoshi Murata taking over from Yoshikazu Fujita and Hayden Hopgood. "Yamada is training with [Super Rugby's] Western Force but has been frustrated at the lack of [playing] opportunities," Jones said. "His physical preparation has been very good and this is an opportunity for him to show what he can do. "Murata comes in because of his excellent attitude at training. He is a back-row option for the World Cup and we are keen to give him an opportunity." Hong Kong, meanwhile, have made six changes after their opening 33-26 loss to South Korea at home last Saturday. This includes two new caps in lock forward Adam Butterfield who will start, and number eight Damian "Moses" Bailey, who will come off the bench. In the backs, fly-half Ben Rimene replaces Chris McAdam. "We played poorly against Korea and I'm looking for a much-improved performance against Japan," head coach Andy Hall said.