The Super of Nigeria recorded their first win at the 2019 Women's World Cup in France with a 2-0 win over South Korea.
Nigeria went ahead when defender Kim Do-yeon volleyed past her own keeper. Ex-Arsenal player Oshoala held off a defender before rounding the keeper to score Nigeria's second goal.
South Korea, who face Norway in their third and final group match on Monday, have yet to score or earn a point.
Nigeria will confirm a place in the knockout stage if they beat hosts France, one of the tournament favourites, on Monday (20:00 BST) in Rennes.
However, they could also advance as one of the four best third-placed teams.
"We said when we started that we wanted to be in the last 16. Nothing has changed," said Nigeria boss Thomas Dennerby.
"We already have a good team spirit but maybe this win will give us a little bit more. Now we go to play France, a really good team.
"If we can come out with a point everyone would be extremely happy."
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