Serena Williams made her first Grand Slam appearance as a mother at Roland Garros on Tuesday.
There was a little rust to shake off on her return but all the same Serena was too strong, and too good, for her world 70-ranked opponent to set up a meeting with Australia's Ashleigh Barty in the next round.
Williams, the victor of an Open era record 23 Grand Slam titles, had arrived at Roland Garros with just four matches under her belt in 2018.
The 36-year-old got off to a winning start in straight sets over Kristyna Pliskova.
"I don't know how many aces there were", Williams smiled courtside after the match.
Caroline Garcia showed her first "Fly with Caro", the nowadays usual celebration, after a dominating 6-1 6-0 win over Ying-Ying Duan.
It's Williams' first major championship since giving birth in September, and this was was her first match on clay this season.
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Serena struggled to read the Czech's big serve in the opening exchanges, but Pliskova lacked variety and efficiency in return as Serena lost just a single point on her first deliveries in the opening set.
No.11 seed Julia Goerges reached the second round of the French Open and completed her 258th career win by beating No.32 Dominika Cibulkova 6-4, 5-7, 6-0. For the special occasion, she chose a unique outfit: a full length black bodysuit with a pink stripe.
Sharapova was given a tough challenge by Dutch qualifier Richel Hogenkamp but eventually prevailed 6-1, 4-6, 6-3. Two years has been a long time but I trained really hard on the clay. Then came singles matches that actually counted, with two wins at Indian Wells, Calif., before a loss to Venus, followed by a first-round loss at the Miami Open on March 21.
'I'm very happy, ' said Williams.
Cilic, a runner-up at the Australian Open earlier this year, led 6-3, 5-4 when their first-round match was stopped.
French Open organisers stick rigidly to the WTA rankings, so would not seed Serena.