  We derive the latest constraints on various simplified models of natural SUSY
with light higgsinos, stops and gluinos, using a detailed and comprehensive
reinterpretation of the most recent 13 TeV ATLAS and CMS searches with $\sim
15$ fb$^{-1}$ of data. We discuss the implications of these constraints for
fine-tuning of the electroweak scale. While the most "vanilla" version of SUSY
(the MSSM with $R$-parity and flavor-degenerate sfermions) with 10% fine-tuning
is ruled out by the current constraints, models with decoupled valence squarks
or reduced missing energy can still be fully natural. However, in all of these
models, the mediation scale must be extremely low ($<100$ TeV). We conclude by
considering the prospects for the high-luminosity LHC era, where we expect the
current limits on particle masses to improve by up to $\sim 1$ TeV, and discuss
further model-building directions for natural SUSY that are motivated by this
work.
