This can be a very long list. I'll throw first some of the biggest names. Keith Thurman Gary Russell Danny Garcia Daniel Jacobs Amir Khan (probably retired) Kell Brook Charles Martin Oleksandr Gvozdyk (seems to have retired) Eleider Alvarez Sergey Kovalev (I don't think he'll fight again) Errol Spence (for medical reasons, but still) Some, like Golovkin and Beterbiev, have been on vacation since last year, but are scheduled for late December, so let's give them the benefit of the doubt.
Luis Ortiz Kubrat Pulev (unless the Belfort rumours are true lol) Yuniel Dorticos Ilunga Makabu Josesito López Viktor Postol Emmanuel Tagoe Jessie Magdaleno Reymart Gaballo
Amir Khan is most certainly not "probably' retired". He will definitely box again, whether it's against a useless opponent or a decent name. He loves the money. Kovalev less likely than Khan but probably will box again at least once more.
