Second seed Karolina Pliskova was just happy not to have her twin sister on the other side of the net as she made a winning start at the Eastbourne championships on Monday.
The former world No. 1, given a bye in the opening round, booked her spot in the last-16 with a straightforward 6-3, 6-3 defeat of Margarita Gasparyan on the Devonshire Park grass.
It was her first match since losing a three-set thriller to 112th-ranked sister Kristyna in Birmingham last week, in what was the first main Tour meeting between the Czech 27-year-olds.
"I didn't really enjoy myself if I compare my match today and the match with Kristyna," the big-serving world No. 3, who will be one of the fancied players at next week's Wimbledon championships, told reporters.
"It's totally different feeling if you play somebody, you know, not from your family. I didn't enjoy the match at all, not even for a while. But on the other hand, I'm just happy that it happened, because it can happen in the future and it's gonna happen for sure again somewhere.
"So I think it's good that it's behind us."
Teenager Vondrousova was playing her first match since the French Open final in which she was beaten by Ashleigh Barty.
The 13th seed beat China's Saisai Zheng 6-2, 6-3 for her first Tour level victory on grass -- a surface she admits is still something of a puzzle.
"You have to be more aggressive on grass and have a high first serve percentage," said Vondrousova, whose game is perfect for the slower claycourts.
Not that she will put the drop shot back in the box though, the shot she used to such devastating effect during her run to the final at Roland Garros.
"I think I tried five today and made two so we'll see," she said. "It's about using more slice."
Former French Open champion and last year's Wimbledon semifinalist Jelena Ostapenko won the last four games in each set to beat Romania's Mihaela Buzarnescu 6-4, 6-4 and set up a clash with American Sloane Stephens.