Iga Swiatek said she needs to play with 'more consistency' despite making it 31 wins in a row.
The world number one was short of her recent high performance levels as she met Danka Kovinic in the third round at Roland Garros.
However, she is still yet to drop a set in the competition so far after breaking late in the second to close out a 6-3, 7-5 win.
"I wanted to play really aggressively but sometimes I feel I was putting too much power and it was hard to control it," Swiatkek told Mats Wilander on court after the game.
"I needed to play with a little less risk and be more consistent. She did a pretty good job of defending and giving back at full speed.
"She was serving really precisely - it was a little tricky but I have played with some heavy hitters already but it was pretty hard to adjust at the beginning.
"I feel like I can play more fearlessly but today I lost both the breaks. But playing well at the beginning is putting pressure on my opponents, which is important."
Iga Swiatek said she will now take some time out to watch the Champions league final in Paris tonight before resuming her bid for a second French Open title on Monday.
She was giving little away about who she is rooting for, though, simply writing 'Real Madrid or Liverpool?' on the camera before she left the court.
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