@dtolnay for outstanding work on Serde, taking it from a great library into an outstanding library, improving documentation significantly, being on top of the macros 1.1 transition, and even developing a new high level library for making custom derive under macros 1.1 easier to work with.
@sgrif for outstanding work on Diesel, an ORM that will change the game for ORMs, and for being incredibly helpful and friendly with early adopters.