In the victory, Barty won 83 percent of her first serve points and 62 percent of her second serve points.
Gavrilova joins Stosur in the final 32 after the veteran clay-court star ruthlessly downed doubles partner Anastasia Pavlyuchenkova 6-2 7-6 (7-0) to set up a third-round match against 2016 champion Garbine Muguruza.
The first set showed the advantage of playing regular competitive tennis on the circuit.
The very first game featured an ace at 112 m.p.h., and when it ended with Pliskova netting a backhand, the chair umpire intoned, "Jeu, Madame Williams", - French for "Game, Mrs. Williams, " a change from the "mademoiselle" officials use for unmarried female players.
"She's playing unbelievable, and she's had such an wonderful year last year and this year as well", said the three-times French Open champion and former world No.1. I want to play my game, regardless of who is on the other side. That's hard. And just coming back from the physical of having a baby, at my age (smiling) is never, I think, really easy.
"I guess my only choice is to live and find out". But I had all the right ideas, like coming to the net and hitting all my shots. Taylor Townsend's match against Myrtille Georges was just starting as Williams' was ending, and Alison Riske is set to face Simona Halep later in the day.
"I have been really enjoying it". So I was, like, I've got to cut down on the errors, and I've just got to come out here and fight.
In addition to showing off her insanely fit physique, the full-length black bodysuit is created to help protect against blood cots and serve up (no pun intended) serious superhero vibes. "What she's done to be able to get back, along with Vika (Azarenka) as well, and a lot of the other girls who are coming back after pregnancy, is a pretty wonderful thing".
Azarenka herself wasn't given a seeding at Wimbledon past year after returning to the game following the birth of her son.
Then, out of nowhere, it was as if a switch had flipped. No one can do it like her.
Barty came out pretty strong, but it was clear that Serena was not playing up to her usual level from before her break from tennis.
Third seed Marin Cilic reached the second round with a 6-3, 7-5, 7-6 (7/4) win over Australia's James Duckworth.
After statistics that were so negatively lopsided in that initial set, in which she managed to produce only three winners, Williams straightened things out, to the tune of 25 winners the rest of the way. She competes better than anybody for a long, long time. Her serve held up, and she was able to outhit her opponent and win the match.
On if she wants more kids: I told Alexis I hope it's another girl.
"The fear that I can't be both the best mother and the best tennis player in the world".
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