WTA · Right-handed · 3 charted matches · 2021–2023
Kathinka Von Deichmann
Shot expected value
The share of points Kathinka Von Deichmann goes on to win after each option in the positions they face most often, shrunk toward tour average when the sample is small. Showing the 8 most-used options; teal marks the best one with at least 30 shots.
Rally, shots 5–8: drive to your backhand side
position worth 45% to the average player · 72 shots
| Option | Used | Win % | Tour |
|---|---|---|---|
| BH slice crosscourt | 39% | 39.8%±11.6 | 40.4% |
| BH slice through the middle | 35% | 39.7%±12.0 | 34.4% |
Rally, shots 5–8: drive to your forehand side
position worth 43% to the average player · 32 shots
| Option | Used | Win % | Tour |
|---|---|---|---|
| FH crosscourt | 38% | 48.0%±14.5 | 46.7% |
| FH down the line | 38% | 49.9%±14.5 | 44.9% |
Serve under pressure
Deuce court
| 1st serve | Usage | Break pt | Won when in |
|---|---|---|---|
| Wide | 31% | 50% ▲ | 51% / 66% |
| Body | 45% | 33% ▼ | 54% / 57% |
| T | 24% | 17% | 71% / 68% |
94 normal · 6 break-point 1st serves
Ad court
| 1st serve | Usage | Break pt | Won when in |
|---|---|---|---|
| Wide | 32% | 24% | 65% / 66% |
| Body | 40% | 48% | 59% / 56% |
| T | 29% | 29% | 61% / 64% |
73 normal · 21 break-point 1st serves
Is the serve mix in equilibrium?
Game theory says a well-mixed server wins equally often with every direction they use. If one direction wins more, it's underused and points are being left behind. This is the minimax test Walker and Wooders ran on Wimbledon finals, applied to every charted first serve. Win rates include faults. "Optimal" allows for returners reading a habit. A direction loses 0.19 points per 100 serves for every 10 points of habitual usage, measured from WTA servers whose mix drifted between matches. Shifts stay within the range servers' habits actually vary, the only range that response was measured over.
Deuce court
| 1st serve | Usage | Points won |
|---|---|---|
| Wide | 32% | 40.9%±10.3 n=32 |
| Body | 44% | 54.4%±9.5 n=44 |
| T | 24% | 47.4%±11.2 n=24 |
Consistent with an optimal mix (p = 0.08).
Ad court
| 1st serve | Usage | Points won |
|---|---|---|
| Wide | 30% | 50.0%±10.8 n=28 |
| Body | 41% | 50.5%±9.9 n=39 |
| T | 29% | 52.9%±10.9 n=27 |
Consistent with an optimal mix (p = 0.89).
Return by serve direction
Return points won against each serve direction, compared with the tour average.
| Serve | Court | Direction | Points | Won | vs tour | |
|---|---|---|---|---|---|---|
| 1st | Ad court | Body | 14 | 50% | +6.5±12.4 | |
| 1st | Ad court | T | 18 | 43% | +7.5±11.8 | |
| 1st | Ad court | Wide | 29 | 28% | −6.8±9.6 | |
| 1st | Deuce court | Body | 39 | 43% | +0.6±9.8 | |
| 1st | Deuce court | T | 21 | 35% | +2.5±11.0 | |
| 1st | Deuce court | Wide | 13 | 38% | +3.7±12.2 | |
| 2nd | Ad court | Body | 9 | 58% | +2.7±13.0 | |
| 2nd | Ad court | Wide | 10 | 55% | +1.6±12.9 | |
| 2nd | Deuce court | Body | 10 | 53% | −1.1±13.0 | |
| 2nd | Deuce court | T | 7 | 62% | +5.6±13.2 | |
| 2nd | Deuce court | Wide | 2 | 50% | −3.4±14.5 |
Signature patterns
Recurring sequences that win more than Kathinka Von Deichmann's own baseline, ranked by edge weighted by how often they're used.
Serve → +1
- Not enough data
Return
- Not enough data
Rally, consecutive own shots
- FH direction unknown → FH direction unknown used 22.3% · won 54% · +9.1±11.6 vs own baseline
- BH slice direction unknown → FH direction unknown used 23.4% · won 45% · +0.3±11.4 vs own baseline