Orienteering (North American Sprint) 19:19  2.5 km (7:44 / km)
Sprint at Dartmouth College.
I started off poorly, then made some minor mistakes. My calf finally gave out about 2/3rds of the way through the race. I couldn't sprint anymore so had to adjust my stride to a fast hobble.
I made a fairly sizable error in the last few controls. I cross the road, ran along the building, then turned right. The problem was I cross the wrong road. I lost close to 2 minutes on that control. That plus my calf was enough to put me way back.