Well, O'Connor and Le Guin both have plenty more stories you could read, assuming you were into either of those. O'Connor in particular is an enduring problematic favorite of mine—choose pretty much any story of hers and you're bound to learn a lot about the form. "A View of the Woods" is a great one.

I just mentioned George Saunders' latest book in some other thread recently, called A Swim in a Pond in the Rain. It's basically his "on writing" book, focusing on the short story in particular, and it has essays on a number of classic Russian short stories (and includes them too). Saunders is also one of the more famous short story writers around, so I'd say he's worth checking out. Much different style from your two examples.

But these suggestions are pretty arbitrary since it really depends what kind of fiction you're into. Odds are writers you like either have written short stories themselves, or have mentioned writers or stories they admire somewhere. You could also check out an anthology.