Nistelrooy scored in the La Liga clash on Sunday.
The Dutchman told RealMadrid.com: “I think the most important thing is that we played well – this is Real Madrid.
“We saw this when we had nine players against Valencia, but then we had two sloppy games. Today, again, we saw the Madrid that we want to see.
“The team was very solid at the back, and we took the opportunities that were presented to us. What was key was our mentality, and playing well this way increased our chances of victory.”
He added: “Racing played a good game today, but we also played well. We’ve seen the Real Madrid that we want to see. It was a tough game but the win gives us confidence. We have to keep this going.”
