Japan swept aside Thailand 4-0 on Saturday to secure a spot in the quarterfinals of the Asian Under-23 Championship, the continent's final qualifying competition for this summer's Rio de Janeiro Olympics.

Albirex Niigata forward Musashi Suzuki fired Japan in front midway through the first half and further goals from Shinya Yajima and substitute Yuya Kubo (twice) ensured Makoto Teguramori's side made it two wins out of two and booked a place in the last eight ahead of its final Group B match against Saudi Arabia on Tuesday.

"We made some changes to the team and it was great that we were able to show the overall strength we have," said Teguramori, who made six changes to the team that started Wednesday's 1-0 win over North Korea.