Suzanne Collins, the author of The Hunger Games and its sequels? I should not have called those "fantasy." They're set in the future (a dystopian future, but dystopia itself is characteristic of sf rather than fantasy), and so far as they have innovative world features, they seem to be sold to the reader/viewer as advanced technology. The worldbuilding isn't rigorous, but that just makes them not hard sf; they're at least as much science fiction as, say, "The Midas Plague" or "Coventry."