The win marks the first time IU has beaten a top-five team since 2006 when the Hoosiers (8-3, 0-3) defeated then-No. 5 Ohio State.
Duke went up 2-0 early in the first period but responded with three unanswered goals throughout a seven-minute period in the ?second half.
“We did not play our best in the first half,” IU Coach Amy Robertson said in an IU Athletics release. “We could choose to continue to play mediocre field hockey, or we could make some changes, play with some confidence, trust your teammates and go hard. That’s what the ?team did.
“It wasn’t a sweet and soft halftime talk. It was a reality check. The team responded unbelievably.”
The Hoosiers’ goals came from freshman Taylor Pearson, junior Karen Lorite and junior Sydney Supica in that order.
For Supica, it was the second game in a row that she found the back of the net.
Goalkeeper Maggie Olson had nine saves, six of which came in the second period.
The win came two days after IU dropped its Big Ten opener to Michigan 3-2 on Friday.
“In some ways we did a good job of playing our game,” Robertson said. “We worked on some things against Michigan that I thought were working really well and forced them into a lot more turnovers than they normally have. The downside of it was we didn’t always take care of the ball and move the ball the way we should have.”
IU will return home ?1 p.m. Saturday to play host to ?Michigan State.