While she enjoys a protected ranking and can enter the grand slams without having to qualify, that does not automatically mean she can also be handed a seeded position.
Williams, who holds an Open-era record of 23 Grand Slam victories, made her competitive return to the game in March at Indian Wells before an encouraging run to the French Open fourth round was ended by a right pectoral injury.
The BBC's tennis correspondent Russell Fuller says Cibulkova will not be the only one enraged by the decision.
Some players and tennis commentators have said it is unfair that women who go on maternity leave to have a baby lose their ranking, and therefore their seeding at big tournaments.
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With Wimbledon officials indicating that they expected to seed Williams, the player most impacted by that decision - 32nd-ranked Dominika Cibulkova, who would be bumped from the seeding as a result - spoke out against it Tuesday night. The draw will be selected Friday, and the tournament starts Monday. So French Open champion Simona Halep is No. 1, Australian Open Caroline Wozniacki is No. 2, reigning Wimbledon champion Garbine Muguruza is No. 3, and U.S. Open champion Sloane Stephens is No. 4. In May she played in the French Open but was not seeded because she had fallen to 453rd in the world while she was gone. Venus Williams is No. 9, Australia's Ashleigh Barty is No. 17, home favorite Jo Konta is No. 22 and Maria Sharapova is seeded 24th, one place ahead of Serena Williams.
Roger Federer is the top-seeded player in the men's tournament, followed by Rafael Nadal, Marin Cilic, Alexander Zverev and Juan Martin del Potro.
"I think if it was a different player, not her, I think she would not be seeded".
"Why should I not be seeded if I have the right to be?" asked Cibulkova after losing to Angelique Kerber at Eastbourne. I think it's just not fair. "So I think that's why". It's just because she won it many times and she's Serena Williams.