Although Swiatek told reporters earlier she dreaded playing Juvan, she got off to a flying start on a windy main Court Philippe-Chatrier with a 6-0, 7-5 win against the 101st-ranked Slovenian.
“It's never easy to play against your best friend,” Swiatek told reporters in Paris.
“I have some experience because I played with Kaja for a few times. I played with my other friends on junior level. You just try to block this friendship for two hours, just focus on the game.
"I think I'm doing that pretty well. It's nice to have that skill,” added Swiatek, who came to Paris as one of the pre-tournament favouites after winning the Italian Open in Rome without dropping a single game in the final.