The Welsh Academicals and Japan Under 20s entertained an enthralled crowd at Mountain Ash's Parc Dyffryn Pennar before the home side ran out 42-26 victors in an 11-try thriller.
A highly entertaining game saw some dynamic rugby from both sides before the experience of the Welsh Academicals finally eased them to victory in the final quarter.
Japan struck first after only five minutes, with Kenta Nakasone bursting through for a try near the posts. The Academicals leveled with a Nathan Rees try mid way through the half and took the lead following a searing run by Ryan Bayliss into the corner. Japan then benefitted from high risk rugby by the Accies with a further two tries, before Mike Thomas crossed for a well worked try to keep his team in contention, 15 - 19 down at the break.
The game was still finely balanced until Rees and Thomas both completed their brace of tries, which were added to by further scores from Wayne Simms and Loughborough Student, Geraint Walsh, to complete an enthralling exhibition of fast open rugby.
As the countdown continues for RWC2015, Tournament Chief Executive Debbie Jevans visited the Millennium Stadium to discuss preparations for the eight matches and reveal the positive news that 100,000 tickets for games at the home of Welsh rugby have sold in the last seven days.
Jason Harries is targeting a first win on the World Series circuit this season with Wales. The series returns to action this weekend in Dubai where Harries is part of a team hoping to build from its efforts in round one in October.
Wales skipper Jevon Groves says his side have addressed a few points from Gold Coast and aim to 'hit the ground running' in the next two rounds of the World Series, kicking off with this weekend in Dubai before heading off to South Africa next week.
Wales Sevens manager Steff Thomas is hopeful his side can build from a quarter-final spot in the opening round of the World Series in Australia when his side take part in the forthcoming double header in Dubai and South Africa.