Japan humbled South Korea 52-8 in Asian 5 Nations Rugby on Saturday as they aim to secure their fifth title.
South Korea were hoping to home advantage would help them to record an unlikely victory over Japan in the Asian 5 Nations on Saturday.
After a tight first-half, the Japanese began to take control - Hirotoki Onozawa scored his 48th career test try to give Japan a 26-3 lead in the 52nd minute.
The South Koreans fought back and Jang Sung-min broke through to give the partisan crowd something to cheer.
It was the first try scored against Japan in the tournament.
But Onozawa restored Japan's lead before Toshiaki Hirose made it 38-8 after the conversion.
South Korea were simply outclassed and their desperate defence was punished by Takamichi Sasaki with five minutes remaining.
Two minutes later, Sasaki capped the scoring with another try as he was hardly troubled on his way over the line.
Japan went on to seal a 52-8 win to maintain their 100-percent record in the 2012 Asian 5 Nations.
Eddie Jones' side can secure their fifth title with victory against Hong Kong in Japan next week.
Japan edge closer to Asian 5 Nations titleSunday, May 13 2012