Stroke Handicap - Hit Me!

Two players, A and B, both start from the baseline, opposite sides.
Player A starts the rally with a "drop and hit" on every single point. A is also the player who is not allowed to put the ball away with a winner. She will have to hit every ball back to her opponent and rely on consistency to win points.
On the other side, player B is allowed to do anything she wants. She can create opportunities to put the ball away for a winner.
So, player A is the defensive one, B is the offensive player. 
Note: In this tennis drill, by not allowing player A to put the ball away, player B will keep constant pressure thus giving A a very challenging match.
Play first to win 11 points this way and then switch roles.