The Wildcats and Louisville were headed for overtime when a Northwestern player headed into the net a shot that looked as if it were going wide. That gave the Cardinal a 2-1 win.
The unseeded Wildcats finish the season 13-6-4. Tenth-seeded Louisville (14-5-1) goes on to a quarterfinal match at No. 2 Maryland.
Each team scored in the first four minutes Sunday. The Wildcats' Jarrett Baughman - playing with a mask after breaking his nose in practice last week - knocked in a rebound to equalize a Louisville goal from the second minute.
The teams were evenly matched throughout: nine shots apiece, three saves and corner kicks apiece.
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