Hirscher, who is second in the overall men's point race, edged Alexis Pinturault of France by 0.35 seconds on the challenging Gran Risa course.
Hirscher finished with a combined two-run time of 2 minutes, 37.45 seconds. Ted Ligety of the United States placed third with a 2:38.03 .
"I don't feel like I skied my best but that's not easy to do every time," said Ligety, who failed to finish last weekend's giant slalom in France. "I've had a tough European trip and it's nice to put in a decent result."
The Gran Risa is notorious for its length and steep icy inclines; however, Sunday featured fresh snow that made the course more manageable, but also cost Ligety some speed. "It was just so easy and grippy today that I definitely didn't have quite the right approach," he said. "I was thinking it was going to be slicker than it was. I had a couple of those little mistakes and you pay hard on this type of snow, so I'm happy with third."