Kerber is a beast. People are always (justifiably) raving about how satisfying it is to see Radwanska take down the unforced error machines with her no-pace variety and strategy. I think watching Kerber's (against that same type of opponent) gutsy defense, pace-absorption and willingness to go for the big shot AT THE RIGHT TIME are equally thrilling.
These two are the antithesis of the "What's Wrong With Her?" thread.