Ymer, who faces No.4 seed and last year's finalist Casper Ruud in the first round, earned his third Roland-Garros main draw spot on Friday with a commanding 6-3, 6-4 scoreline over in-form second seed Yannick Hanfmann.
"I don’t want to say a relief, but this week has been a love and hate over the years at Roland-Garros," said the Swede, who returns to the main draw for the first time since 2018.
"Some years it's been amazing, some years it's been tough. I came very well prepared and I'm very happy to get through."
Small steps, big results
The world No.155 managed an impressive feat of qualifying for all four Grand Slams in 2015 and has since chipped away at the tour with enhanced knowhow.
"Roland-Garros is where I got my first Grand Slam main draw win (in 2018). I'm now way more experienced, when I was younger and qualified, that became such a rush," Ymer explained.
"When you win, it feels like you did something big already. But you have to keep going, I'm taking it more day by day, staying in the moment is very important."