perhaps Fredric Brown? He and Asimov were in my primary school reading anthology, and I will never thank enough the people who put the book together.

Also, I am not sure he's translated in English, but Sessanta Racconti[0] by Dino Buzzati is high on my list of fantastic short stories (not sci-fi, just.. I don't know).

[0] https://en.wikipedia.org/wiki/Sessanta_racconti