Davis Cup Qualifiers · RR · Clay · 4 Mar 2022
Tallon Griekspoor v Steven Diez
72–59 in points · Tallon Griekspoor won
Why it went the way it did
Tallon Griekspoor won 9.2 more points than Steven Diez relative to what the serve alone predicted. Steven Diez's biggest leaks: backhand execution −2.5, net execution −1.9, forehand execution −1.6.
Each shot moves its hitter's chance of winning the point. Those moves are split into direction choice, shot selection and execution, and summed here. Read both columns together: one player's gain is the other's loss.
| Shot | Tallon Griekspoor | Steven Diez | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | +0.1 | +0.1 | −1.1 | −0.9 | −0.1 | −0.2 | −1.0 | −1.2 |
| Serve 2nd | ±0.0 | +0.1 | −0.8 | −0.7 | ±0.0 | ±0.0 | +0.5 | +0.4 |
| Return | +0.2 | +1.4 | −1.6 | +0.1 | ±0.0 | +0.1 | −0.7 | −0.6 |
| Forehand | +0.2 | +4.4 | −0.1 | +4.5 | −0.2 | +3.0 | −1.6 | +1.2 |
| Backhand | −0.1 | +0.7 | −1.5 | −1.0 | ±0.0 | +0.2 | −2.5 | −2.3 |
| Slice | +0.1 | −1.2 | +0.2 | −0.9 | +0.1 | −1.3 | +1.2 | −0.1 |
| Net | ±0.0 | +0.2 | +2.2 | +2.5 | −0.1 | +0.3 | −1.9 | −1.6 |
| Touch | ±0.0 | −0.5 | +0.6 | +0.1 | −0.1 | −1.0 | −0.4 | −1.4 |
| All shots | +0.6 | +5.1 | −2.1 | +3.6 | −0.4 | +1.2 | −6.4 | −5.6 |
Set by set
| Set | Tallon Griekspoor | Steven Diez | Net, Tallon | |
|---|---|---|---|---|
| 1 | +1.4 | −3.2 | +4.6 | |
| 2 | +2.2 | −2.5 | +4.7 |
Adaptation
First-serve direction mix set by set, with the share of points each direction won. The scores measure whether the server moved toward the directions that had been winning earlier in this match, set to set and every two to three service games, in points per 100 first serves. Read them as a habit, not a gain: across the tour, a direction's edge in early sets barely predicts the later ones. Whether the returner responded can't be told apart from noise within one match.
Tallon Griekspoor serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 60% 73% | 4% 100% | 36% 89% |
| 2 | 62% 67% | 7% 50% | 31% 56% |
Within sets +0.17 per 100 first serves, every two to three service games
Steven Diez serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 21% 71% | 12% 75% | 68% 57% |
| 2 | 26% 55% | 14% 33% | 60% 54% |
Set to set +0.04 per 100 first serves in sets 2+
Within sets +0.01 per 100 first serves, every two to three service games
Counterfactual: the best direction every time
If each shot had gone in the direction that is usually worth most for that stroke and position, this is how many more points each player would expect to win. It's an upper bound: the best direction isn't always on, and the chart can't see the ball's pace or position.
Tallon Griekspoor
7.8 points left on the table across 243 shots 3.21 per 100 shots
- Return of a 1st serve, T, ad court hit FH through the middle ×7; FH inside-in rates higher · 1.14 pts
- Rally, shots 5–8: drive to your middle, you at net hit FH volley through the middle ×3; FH volley crosscourt rates higher · 0.65 pts
- Return of a 1st serve, T, ad court hit FH down the line ×2; FH inside-in rates higher · 0.37 pts
- Return +1: drive to your forehand side hit FH through the middle ×5; FH crosscourt rates higher · 0.29 pts
Steven Diez
6.6 points left on the table across 224 shots 2.95 per 100 shots
- Rally, shots 5–8: drive to your backhand side hit FH through the middle ×3; FH inside-in rates higher · 0.28 pts
- Rally, shots 5–8: drive to your backhand side, you at net hit BH volley through the middle ×1; BH volley crosscourt rates higher · 0.26 pts
- Rally, shots 5–8: drive to your forehand side hit FH through the middle ×5; FH crosscourt rates higher · 0.25 pts
- Rally, shots 5–8: volley to your middle, opponent at net hit BH through the middle ×1; BH down the line rates higher · 0.25 pts