Japan remained perfect in the World Cup qualifiers 14-0, with the fifth victory of the second stage coming 16 months after the fourth.
The Japanese scored five goals in the first half, added nine more in the second and now leads Group F with 15 points. A victory over Myanmar on June 3 will secure first place in the group and a place in the third round of the Asian qualifiers.
The eight winners in the group and the top four teams in second place will advance to the next stage, which is set to begin in September.
Takumi Minamino, Yuya Osako, Daichi Kamada and Hidemasa Morita scored in the first half, along with an own goal by Mongolia defender Hash-Erdene Tuya.
Osako finished with a hat trick, while Sho Inagaki, Junya Ito and Kyogo Furuhashi scored two goals each. Takuma Asano also scored.
Japanese coach Hajime Moriyasu has said that a big victory over Mongolia is not a priority.
“Instead of focusing on their opponents, our players focused on what they wanted to achieve for themselves,” Morrisasu said in comments from Kyodo.
“I was able to try different formations and expand my capabilities.”
The Japanese warmed up with a 3-0 victory last week in a friendly match against South Korea, organized after the postponement of their planned match against Myanmar.
The game was scheduled to take place in Mongolia on Tuesday, but was changed due to the coronavirus pandemic. The Asian Football Confederation decided earlier this month to play all other Group F matches in Japan. Mongolia won a 3-0 loss to Tajikistan in Dushabe last Thursday, one of the first matches in the Asian qualifiers since November 2019.
Later on Tuesday, Saudi Arabia defeated Palestine 5-0 in the only other qualifier in the Asian region and moved to the top of Group D over Uzbekistan.
Yasser Al-Shahrani and Fahad Al-Muwalad scored late in the first half to give the hosts the lead in Riyadh. Two goals by Saleh Al-Sheri at the beginning of the second and a late penalty by Salem Al-Dausari completed the route.
(With AP inputs).