Ok, I hadn't played a set in the game since 2 years and half so I was quite rusty.
Me & CPU = 75% in all skills ; CPU Level = Pro-10 volleyer ; me = Powerbaseliner, simulation controls.
I've lost the 1st set at the tie-break, after have had 2 break points at 15/40 in the 3rd (or 4th) serve game of the AI.
In the 2nd set, I managed to break on the 3rd & 4th serve game to win 6/2 once I managed to get a bit more sensations on the short acceleration.
I'm near my limit reflex wise, so I got aced a lot... Getting old...
The best is to return with the acceleration and chain with the short acceleration. Short strike returns aren't too bad, but 2nd strike is in average a tad harder and it's almost impossible to do a winner on the return of serve with it so no free point.
Having a 1-handed backhand might help here.
Play the .dmo's with the unmodded version of the game from the Records menu.