backhand-topspin-against-under-spin

Hey Andreas! Ok so a few things I think will help you. I think the overall technique is good but if you can use your legs and body more in the shot this will really help. So to do this you will need to bend down lower in the knees as the ball comes in a slightly turn your body back, try to pause for a split second and wait for the ball then push up into the shot using your legs and twisting the body slightly as you hi the ball.
You might need to wait a bit longer for the ball so taking it just a tiny bit later to do this, but it will really help you play with a more relaxed arm is it won’t need to do as much of the work in the shot.
Then the last thing is trying to have a relaxed grip, keep a smooth action and really try to release the wrist forward at the end of the stroke which will help get more spin and better placement as well!
Dan 🙂