Atalanta are not as strong as Liverpool, so I still think they will share the points with Real Madrid. I don’t mean to belittle Atalanta impressive record in the Champions League this season, and I don’t want to ignore the half-dozen injuries to Ancelotti key players, but I am trying to see Real Madrid as a team with a number of quality rotation options. Atalanta failed to score against Arsenal and Celtic, which is something to consider. Besides, Ancelotti is no stranger to the Serie A side, and he has plenty of experience of facing them. When Real Madrid are under pressure, they can almost always turn things around, especially in the Champions League.
Atalanta for a truth aren't as Liverpool but for a club that's been tearing teams apart this season and currently at the top of the Italian Serie A table, it's very possible that they can beat Real Madrid at home.
That said, I'm a passionate Real Madrid fan who believes so much on the strength and experience of the team so I'm optimistic that Carlo Ancelotti's men will win at Atalanta but that's of they'll play at their best