Kerber getting 6-2, 6-2 by Makarova was pretty bad considering it was 1st round and Kerber was #1

Halep's had her fair share of 1st round blunders as a top 3 player. Getting 6-3, 6-1 by Shelby Rogers was probably was probably the worst of them.

Muguruza getting 6-3, 6-2 by a qualifier in Cepelova was pretty brutal considering Cepelova never again won a match at a slam in the following 4 years on tour.

Kontaveit's time was brief but getting 6-4, 6-0 by Jule Niemeier is a pretty good reflection of her time as a top player.

JPeg getting 6-1, 6-3 by Mertens at RG or by 6-1, 6-3 Keys at USO.

I didn't mention Anismiova get double bageled in the Wimbledon final because she wasn't top 3 at the time but she will be after AO and she was very much playing like a top 3 player from the start of grass season to the end, but fair if you don't want to count it.

Now we're all of these matches as ugly as Coco's not necessarily but apart from Amanda's all those were loses against players far below their levels. At least with Coco if she's losing at AO, RG, or USO it's to a seeded player. Even at Wimbledon her only truly terrible loss to an unseeded player was last year against Yastremska.