The Group H match was held at the 42,000-seater Mordovia Arena in Saransk earlier on Tuesday. Osako was named man of the match after heading home the winning goal in the second half.

"Scoring a goal at the World Cup has been a dream for me since I was a little kid, that's why I am extremely happy. The World Cup is a huge stage where anything can happen, and I think that we started off very well," Osako said at a press conference.

Japan, who have twice made it past the group stage at FIFA World Cups, will take on Poland and Senegal in their other two Group H matches.