Sports
Tennis Performance Calculator
Evaluate first-serve conversion, serve points won, return pressure, break-point leverage, and match-wide point control from entered match statistics.
Serve–return balance
Measure how many points each side of the racket won
First-serve placement, serve-point conversion, return pressure, aces, and double faults remain separate so one headline rate cannot hide the match pattern.Court pressure view
First serve, second serve, and return conversion
Detailed calculation process
Reconstruct second serves before evaluating conversion
General formulas
S2 = S − S1First-in% = S1 / S × 100First-win% = W1 / S1 × 100Second-win% = W2 / S2 × 100Serve-win% = (W1 + W2) / S × 100Return-win% = Wr / R × 100DR = Wr / (S − W1 − W2)Symbols and units
S total service pointsS1, S2 first serves in and second-serve pointsW1, W2 service points won behind first and second serveWr, R return points won and playedDR return points won divided by service points lost (dimensionless)
Worked substitution with the current match
Point ledger
Won, lost, and unreturned pressure
| Phase | Points played | Points won | Points lost | Win rate |
|---|
Practical examples
Match review
- See whether a lower first-serve percentage was offset by a strong first-serve conversion rate.
- Compare return pressure with points lost on serve through the dominance ratio.
- Separate free points from aces and double faults from the broader point outcomes.
Input discipline
Keep totals consistent
- First serves in cannot exceed service points.
- First-serve wins cannot exceed first serves in; second-serve wins cannot exceed second-serve points.
- Aces are a subset of service points won, and double faults are a subset of second-serve points lost.
Limitations
The calculator does not model opponent quality, break points, score leverage, rally length, serve speed, surface, or placement. The dominance ratio uses point totals and can be unstable in short samples. It is a descriptive match statistic, not a ranking or win-probability model.
Tennis performance FAQ
Can first-serve percentage rise while service performance falls?
Yes. Placement can improve while points won behind the first serve decline.
What does a dominance ratio above 1 mean?
The player won more return points than they lost service points in the entered sample.
Are double faults already included in service points lost?
Yes. They are shown separately for diagnosis but should not be subtracted a second time.