Topspin makes the ball rotate forward, so it can clear the net with room to spare and still dip into the court. In lab tests, club players' topspin forehands spun at about twice the rate of their flat forehands (around 1,500 vs 760 rpm). The two things that best predicted spin were how fast the racket was moving UP at contact and a face held near vertical, tilted very slightly closed. From the side the app reads your hand's low-to-high path and your finish; it can't see the racket face, the ball or its spin.
Start low
Turn early: hips and shoulders together, racket going back with them. This is the same unit turn as your forehand drive, not just the arm pulling the racket back.
your chest turning to the side fence before the ball bounces.
As the forward swing starts, let the racket drop below the height of the ball. In tested topspin forehands the racket fell about 0.3 m in the early forward swing, then rose about 0.2 m in the last part before contact. You can't swing up into the ball if the racket starts above it. Semi-Western and Western grips suit this and a contact point above hip height.
the racket head dipping low behind you, ready to come up.
Don't stop at the bottom. Flow from the backswing straight into the forward swing; a pause at the back costs arm speed.
one continuous loop, no hitch.
Brush up the back
Push up from your legs as you swing. Players hitting topspin extended their hips and knees more into contact than when they hit flat.
your legs lifting you slightly into the shot.
Swing up through the ball, not just forward. Tested topspin forehands came into contact on a path roughly 30–40° above horizontal, against about 20° for flat drives. A steeper path trades some forward speed for more upward speed, which is where the spin comes from.
the strings brushing up the back of the ball.
Keep the racket face close to vertical at contact, tilted only slightly closed. Measured topspin forehands sat about 1–7° closed from vertical, a little more closed than flat ones. Don't open the face to lift the ball; let the upward swing lift it.
a flat, square face meeting the ball while the racket rises.
Let the arm whip up through contact, in front of your body. The forearm's upward speed was the strongest body predictor of upward racket speed, helped by the upper arm rotating inward and the forearm turning over. Your legs and trunk set this up; the arm and hand add most of the speed at the end.
a loose arm snapping up and across, not a stiff push.
Finish high
Keep the racket rising after contact and finish fully, past your opposite shoulder or wrapping around your body. The muscles at the back of the shoulder have to slow the arm down, so let the swing run out instead of stopping it short. Then recover to ready position.
the racket ending high, your hand up near the opposite shoulder.
Feel it
You feel the strings brush up the ball rather than slap through it, and you can see the ball rotating forward. The ball leaves higher over the net than your flat drive and then drops into the court. If it feels like you're lifting with the face (opening it), that's the wrong lift; the lift should come from the swing going up. For scale, elite men's practice forehand drives filmed at Wimbledon qualifying averaged about 1,480 rpm. Honest note: the app follows your wrist and hand, not the racket or the ball, so check spin by watching the ball's rotation and bounce, or with a coach.
Fix-its
- Little spin: your swing goes mostly forward Drop the racket lower before the forward swing and aim the swing more upward through contact. Upward racket speed is the strongest predictor of spin.
- The racket never gets below the ball Let the racket fall as the forward swing starts so it can rise into the ball. Shadow it slowly until the dip-and-rise is automatic.
- The ball floats long Check you aren't opening the face to lift the ball. Keep it near vertical, very slightly closed, and get the lift from a steeper upward swing.
- Arm-only swing with straight legs Bend your knees as you turn and push up from them as you swing. Topspin hitters used more hip and knee extension than when hitting flat.
- Short, stopped finish Swing through to a full finish past your opposite shoulder. Stopping short usually means you slowed the racket before contact.
Drill
- Net-cord brush (USTA): stand at the net, hold a ball between the net cord and your strings, and brush it up and over with a low-to-high swing. Look for forward rotation on the ball.
- Shadow swings: no ball, slow and continuous. Turn, let the racket dip low, then swing up to a full high finish with no pause. Add speed once the shape is clean.
- Drop-feed contrast: alternate one flat forehand with one topspin forehand. Watch the topspin ball leave higher over the net and drop sooner.
- Rally for height: rally crosscourt aiming the ball well above the net and letting the spin bring it down into the court. Keep the face near vertical; lift with the swing.
- Film from the side at 120 fps or higher. Check that your hand starts below contact height and is still rising at contact, then finishes high.
Safety: Semi-Western and Western grips have been linked to injuries on the little-finger side of the wrist. Warm up the wrist and forearm, build topspin volume gradually, and stop and get a coach to check your grip and swing if that side of the wrist gets sore.
By position
Singles players: topspin lets you hit with net clearance and still land the ball deep, which helps in long baseline rallies. Doubles players: a dipping topspin ball is one option for returns and passing shots against a net player; a flatter, lower ball is another. Choosing between them is tactics, which the camera doesn't read.
Sources
- Protheroe — An investigation to determine the kinematic variables associated with the production of topspin in the tennis groundstrokes, PhD thesis, University of Central Lancashire (2011)
- Reid, Elliott & Crespo — Mechanics and Learning Practices Associated with the Tennis Forehand: A Review, J Sports Sci Med (2013)
- Choppin, Goodwill & Haake — Impact characteristics of the ball and racket during play at the Wimbledon qualifying tournament, Sports Engineering (2011)
- Elliott — Biomechanics and tennis, Br J Sports Med (2006)
- USTA, Karl Davies — Improve your game: How to create topspin
Last checked 2026-10-26.