Swiatek, defeater of Cirstea (6-1, 6-1), was as eager as when she entered the fray two days earlier, against the Chinese Wang Xiyu (52nd), dominated 6-1, 6- 4.
The three-time winner of Roland-Garros, on the throne of world tennis for the 100th week, will face either the Belarusian Victoria Azarenka (26th) or the Spaniard Sara Sorribes (55th) for a place in the quarter-finals.
For her first tournament on clay in 2024, Swiatek was beaten in the semi-finals by world No.4 Elena Rybakina in Stuttgart (Germany) a week ago. The 22-year-old Pole reached the final in Madrid in 2023 and lost to world No.2 Aryna Sabalenka.