The serve is the one shot you start yourself, and biomechanically it works like an overhead throw: legs and trunk load, the arm whips up, and the racket meets the ball high, out in front and to the side of your hitting shoulder. Most of the racket speed comes from your upper arm rotating inward and your hand snapping through, but only if the legs and trunk have set it up. From the side a camera can read your trophy position, leg drive and contact reach; it can't see the ball, the toss or the racket itself.
Stance and grip
Hold a Continental grip (the 'hammer' grip from The Grips: index base knuckle and heel pad on bevel 2). Hold the ball in your fingertips with your free hand.
a loose hammer hold, not a frying-pan (forehand) grip.
Stand sideways: back foot roughly parallel to the baseline, front foot angled about 45 degrees, pointing toward the net post on your hitting side. Knees soft, weight balanced.
side-on to the net, like a thrower before the wind-up.
Toss and trophy
Lift the toss with a straight tossing arm while the racket arm swings back and up. Place the ball up, slightly in front and slightly to your hitting side, so you'll strike it with the arm about 100 to 110 degrees up from your side. Avoid tossing straight over the top of your head (12 o'clock): that forces the arm too high and is linked to shoulder impingement.
the tossing arm lifts the ball, it doesn't flick it.
Load into the trophy position: bend your knees (the front knee clearly bent, more than about 15 degrees), let the hitting-side shoulder and hip drop back so the toss-side shoulder sits higher, racket up behind you with the elbow bent. Either bring the back foot up next to the front (foot-up) or leave it back (foot-back); both reach similar racket speed.
coiled and tilted, weight sitting into the legs.
Keep the tossing arm up until the hitting arm starts forward. Dropping it early pulls the trunk open and leaves the hitting arm lagging behind, which loads the front of the shoulder.
the tossing arm points at the ball a beat longer than feels natural.
Drop, drive, contact up and out
Drive up with your legs as the racket drops behind your back. Don't hold the trophy pose: only a short pause at the bottom of the knee bend is acceptable. A long pause bleeds the stretch and slows the arm.
the legs pushing up is what throws the racket down behind you.
Rotate shoulder over shoulder: the hitting shoulder rises as the toss-side shoulder comes down, like a cartwheel, rather than spinning flat around.
climbing up to the ball, not turning sideways into it.
Swing up and out to contact above and slightly in front of your hitting shoulder, arm long but not locked (elbow close to straight). Let the upper arm rotate inward, the forearm turn over (pronate) and the hand snap through the ball.
throwing the racket up at the ball and letting the arm turn over through it.
Follow-through and landing
Let the racket keep going: up first, then forward, then down across to the other side of your body. A long follow-through gives the small muscles at the back of the shoulder time to slow the arm.
the arm winds down on its own, no braking.
Land on your front foot inside the court and absorb it with a bent knee, then recover to ready. Foot-up servers land with bigger braking forces, so build leg strength for landing.
a soft, balanced landing, ready for the next ball.
Feel it
A fluid throw that starts from the ground: knees bend, legs push up, the shoulders tilt and cartwheel, and the arm whips up to a high contact out in front of the hitting shoulder. It shouldn't feel like a shoulder push. Research on professionals found contact height was the steadiest part of the toss, so aim the toss for a repeatable contact height rather than a perfect spot in the air. The app reads your body positions, not the ball's spin, speed or landing, and it can't see the toss or the racket.
Fix-its
- You 'arm' the serve (no knee bend or leg drive) Bend the front knee clearly at the trophy and push up into the ball. In tested players a minimal-leg-drive serve was clearly slower (about 39 m/s racket speed vs 43 to 44 m/s with leg drive).
- You toss straight over your head Move the toss slightly in front and toward your hitting side so contact comes with the arm about 100 to 110 degrees up, not pointing at 12 o'clock.
- Your tossing arm drops early Keep it pointing up at the ball until the hitting arm starts forward.
- You pause at the trophy Make it one continuous motion: a short sit at the bottom of the knee bend, then drive straight up.
- Your contact is low or behind you Reach up and out to hit above and slightly in front of the hitting shoulder with the elbow nearly straight; drive up with the legs to get there.
Drill
- Contact-point start (USTA progression): from mid-service box, start with the racket at contact and serve with a short swing into the box. Focus on hitting out in front and to the side of your body.
- Abbreviated serve: from the service line, add the start of the follow-through, then the backswing, then the full motion. Only move back when the short version lands consistently.
- Toss-and-hit, not just toss-and-catch: practise the toss as part of a swing so you groove the same contact height. Pros vary where the ball is front-to-back and side-to-side, but contact height stays steady.
- Leg drive check: serve a short set focusing only on a clear front-knee bend and pushing up; then film from the side to see the knee bend and the reach at contact.
- Safety: warm up the shoulder and legs before serving, build serve volume over weeks (tennis injuries are mostly overuse), and stop if you feel shoulder, elbow or low-back pain. Avoid repeatedly arching the low back hard at the trophy.
By position
Singles players: your serve starts every service point on your terms, so work on a reliable motion before adding pace. Doubles players: placement and consistency matter more than raw power; a double fault loses the point for your team, and a well-placed serve helps your partner at the net.
Sources
- Kovacs & Ellenbecker — An 8-Stage Model for Evaluating the Tennis Serve, Sports Health (2011)
- Elliott — Biomechanics and tennis, Br J Sports Med (2006)
- Reid, Elliott & Alderson — Lower-limb coordination and shoulder joint mechanics in the tennis serve, Med Sci Sports Exerc (2008)
- Whiteside, Giblin & Reid — Redefining spatial consistency in the ball toss of the professional female tennis serve, ISBS (2014)
- USTA — Tennis 101 for Adults (2018)
- CUHK PE Unit — Tennis notes (2025)
Last checked 2026-10-26.