Continental Grip

Used for: Serve, Volley, Slice, Overhead, some defensive shots
Both the base knuckle of the index finger and the heel pad will be placed on the #2 bevel (also works if both are on the #6).  Feel the special raised bumps on the Grip Guide bands for this shot. 
Tip: Don't forget your "trigger finger".  Your index finger does not wrap around with the other three fingers.  It will curve slightly above the Tennis Grip Guide.  Part of the Grip Guide numbers will be showing through.
You can use the continental grip like all the pros: