The British ace battled through at Roland Garros with a three-set victory against Wang Xinyu and she was relieved to progress in Paris after feeling unwell in the lead-up to the match.
Speaking to TNT Sports, Raducanu said: "I would’ve felt worse if I lost that match, but I was struggling today.
"I was really struggling from the start, but that's Wang Xinyu, who’s a top opponent. She can take the racquet out of your hands. I was really flat, but I'm really happy to have kind of found a way.
"I think opening rounds are never easy, and I haven't been here in three years, so I think there was a combination of a lot of things.
"But yeah, happy to have got through at least."
Raducanu came through a deciding set to book her place in round two and thinks the victory showcased her mental resilience on the court as she recovered from the disappointment of losing the second set to her Chinese opponent.
The former US Open champion said: "It was extremely important, especially when you're not feeling very energetic. So, I just knew I had to start well, because that would give myself the best chance to keep fighting and keep going for every point, and I managed to kind of get a good beat.
"I can take positives from that. A lot of top champions in the first round have saved match points, but have given themselves another opportunity in the draw, another match, despite how they’re feeling.
"I think that is a big positive that is not necessarily easy to teach. A shot is easier to work on, whereas I showed character, heart and fight, and I'm very proud of that."
Raducanu now faces a mouthwatering clash against defending champion Iga Swiatek and is looking forward to taking on the Pole.
She said: "I'm very happy to give myself another chance in the draw.
"I felt the noise around the match, even before playing our first rounds. I'm looking forward to going out there, obviously with not as much pressure on me.
"I think my game is actually in a pretty good place, so it’s a good challenge."