"We are just doing what we can every day," the 26-year-old told La Sexta.
"I am in the quarterfinals and it makes me very happy to have another chance to play in Madrid in front of these magnificent fans.
"It's not the time to be talking more than necessary. I will try to enjoy every moment as much as possible."
Meanwhile, sixth seed Tomas Berdych sealed a quarterfinal place with a 7-6 7-5 win over Kevin Anderson.
Jo-Wilfried Tsonga, seeded seventh, came from a set down to defeat Spain's Fernando Verdasco 4-6 6-3 6-2.
But there was bad news for Djokovic's conqueror, Dimitrov, who was beaten 3-6 6-4 6-1 by Stanislas Wawrinka.
In the women's side of the tournament, World No.1 Serena Williams cruised into the last eight with 6-3 6-1 win over Maria Kirilenko.
Williams, who suffered a shock opening round defeat at last year's French Open, has now won eight straight matches on clay this season.
"I think more than anything I learned not to become overconfident," she told reporters.
"I think I'll just take that with me to the French this year. I think I was a little confident last year and I felt really good; this year I'm going to take every moment like it's my last."
Maria Sharapova booked her place in the quarterfinals with a comfortable 6-2 7-5 win over Germany's Sabine Lisicki.
And Sharapova, currently ranked second in the world, believes she's in great form going into the defense of her title at Roland Garros.
"I think when you win a Grand Slam on a surface, it would be pretty mean of me to say that I'm not comfortable on the surface," she told reporters.
"It took me many years to get to the level of where I am today. It certainly didn't happen overnight.
"I worked extremely hard on getting stronger and recovering better, moving better on the court, giving myself a better position on the court, especially after being on the defensive and trying to play aggressively as I always do on quicker surfaces."