But they couldn't have expected Thora Helgadottir's performance.
The junior goalkeeper from Iceland had nine saves and held UNC scoreless for 110 minutes as the Blue Devils played the No. 2 Tar Heels to a double-overtime scoreless tie at Fetzer Field on Sunday.
The Tar Heels (13-1-3, 3-1-1 in the ACC), who were 31-1 against Duke (6-8-2, 1-3-2) entering the game, played without Lori Chalupny, Catherine Reddick, Amy Steadman and Jordan Walker. Chalupny is out for four to six weeks with ligament damage, and both Steadman and Walker are out for the season with knee injuries.
Reddick, who is in California competing with the U.S. National Team at the CONCACAF Women's Gold Cup, won't be back until the NCAA Tournament.
"They're excellent players, and we miss them," Dorrance said. "But it doesn't excuse the fact that we didn't come to play in the first half."
The Tar Heels played sluggishly in the first stanza, losing passes and hitting their shots wide or weakly. They had scoring opportunities, but Duke's defense smothered UNC's attack.
"Duke came out really strong," said junior midfielder Maggie Tomecka. "They played the way we always want to play, with a really strong defense, always two people attacking the ball."
In the second half, the Tar Heels played more aggressively, attacking Helgadottir and the Duke defense.
"At halftime Anson told us we had to stop playing as passively as we were in the first half," Tomecka said.