Minor correction to the above. I'm going to use some Electronics terms here, so pay attention.
Ohm's Law states: Voltage/Resistance=Current. Applying a little mathmatical manipulation allows you to find the "On Resistance" if you are given the Voltage at a given Current as in the above specs for the ESC.
Here's the correct equasion and result.
Voltage/current=Resistance .075v/10A=.0075ohms
As you can see, the "On Resistance"= 0.0075ohms