What is MEP serve grip?


well, MEP does seem to have great consistency with his continental grip, underspin & lobbing game. It kind of reminds me a little of this style of tennis:



What do you think could one with a slightly similar motion to MEP-s serve creat topslice spin on this serve?
I do not mean topslice serve i mean topslice spin that makes the ball curve forward and to the right (he is lefty)..
(I know this is not a quality serve, but until 4,5 it seems to be decent, and has not only drawback, has advantage over school serve too)