It marked the second time the pair had met after Pliskova's straight-sets result on her way to the Miami final in March. On the slower red clay in Paris, however, she admitted her power was nullified somewhat.
"Obviously she's playing well this year, especially on clay," Pliskova said. "She won titles so she's playing confident. She was serving well. She just sometimes went for her shots and then she was patient.
"I think on clay it's just too difficult always to just go for it. I don't know. I think I just didn't play that well. Maybe I was a little bit, at some points, passive, maybe not that fast. My serve wasn't really working. I don't think she did much wrong today, so I think she played clever. She was patient."
In the battle between a teenager and a clay-court veteran, it was the 19-year-old Marketa Vondrousova who triumphed in an hour and 29 minutes to beat No.28 seed Carla Suarez-Navarro.
Her 6-4, 6-4 victory on Court Simonne-Matthieu earned the Czech passage through to the last-16 where she will face No.12 seed Anastasija Sevastova from Latvia. In a 3hr, 18 min epic against No.20 seed Elise Mertens, the Latvian saved five match points and only needed one of the three she earned when serving out the match at 10-9 in the third set on Court Suzanne-Lenglen to reach the fourth round - her best performance at Roland-Garros.
Meanwhile, home favourite Lucas Pouille's battle with Slovak Martin Klizan, which was suspended overnight., resumed with Klizan two-sets-to-one up. Pouille managed to take the fourth to force a decider on Court Philippe-Chatrier, but the decider goes the way of Klizan after a total of 4hr, 7 minutes, 7-6 (7-4), 2-6, 6-3, 3-6, 9-7. Au revoir, Lucas!