Who is the strongest character Batman can beat without prep?

We all know Batman is a prep master but what if he had no prep? Who is the strongest character he could beat with only his standard gear and his Pre-New 52 self?

Spider-Man or Captain America maybe I'm not sure

Grundy physically

@cara_hunter: good response. Didn't think of that

@giantsfan576: Cap, Wolverine, Daredevil, Blackpanther someone in those levels of power and skills