s Hertogenbosch · R32 · Grass · 11 Jun 2018
Coco Vandeweghe v Aliaksandra Sasnovich
88–69 in points · Coco Vandeweghe won
Why it went the way it did
Coco Vandeweghe won 13.3 more points than Aliaksandra Sasnovich relative to what the serve alone predicted. Aliaksandra Sasnovich's biggest leaks: forehand execution −4.5, return execution −3.2, backhand execution −2.1.
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 | Coco Vandeweghe | Aliaksandra Sasnovich | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | +0.4 | +0.1 | +0.3 | +0.8 | −1.0 | −0.1 | −0.8 | −1.9 |
| Serve 2nd | −0.1 | ±0.0 | +0.6 | +0.4 | +0.1 | ±0.0 | ±0.0 | +0.1 |
| Return | +0.4 | +0.6 | −2.2 | −1.1 | −0.1 | +0.2 | −3.2 | −3.1 |
| Forehand | ±0.0 | +1.4 | +0.4 | +1.8 | ±0.0 | +0.6 | −4.5 | −3.9 |
| Backhand | ±0.0 | +0.8 | +0.1 | +1.0 | +0.3 | +0.2 | −2.1 | −1.7 |
| Slice | ±0.0 | −1.7 | −0.6 | −2.2 | +0.1 | −1.0 | −0.8 | −1.7 |
| Net | −0.5 | ±0.0 | +1.7 | +1.2 | ±0.0 | +0.1 | +0.2 | +0.3 |
| Touch | −0.1 | −0.6 | −0.3 | −1.0 | ±0.0 | −0.2 | −0.3 | −0.5 |
| All shots | +0.1 | +0.7 | ±0.0 | +0.9 | −0.7 | −0.2 | −11.6 | −12.5 |
Set by set
| Set | Coco Vandeweghe | Aliaksandra Sasnovich | Net, Coco | |
|---|---|---|---|---|
| 1 | +1.5 | −5.8 | +7.3 | |
| 2 | −0.6 | −6.6 | +6.0 |
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.
Coco Vandeweghe serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 50% 64% | 14% 100% | 36% 88% |
| 2 | 39% 79% | 3% 0% | 58% 76% |
Within sets +1.27 per 100 first serves, every two to three service games
Aliaksandra Sasnovich serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 28% 50% | 42% 47% | 31% 55% |
| 2 | 38% 63% | 38% 50% | 24% 67% |
Set to set +0.40 per 100 first serves in sets 2+
Within sets +0.34 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.
Coco Vandeweghe
6.2 points left on the table across 228 shots 2.71 per 100 shots
- Rally, shots 5–8: lob to your middle, you at net hit Smash through the middle ×2; Smash crosscourt rates higher · 0.50 pts
- Return of a 2nd serve, wide, ad court hit BH slice down the line ×1; BH slice through the middle rates higher · 0.26 pts
- Return +1: drive to your forehand side hit FH through the middle ×4; FH crosscourt rates higher · 0.25 pts
- Serve +1: mid-depth return to your middle hit FH through the middle + approach ×2; FH down the line + approach rates higher · 0.25 pts
Aliaksandra Sasnovich
4.8 points left on the table across 202 shots 2.40 per 100 shots
- Serve +1: deep return to your middle hit BH down the line ×4; BH crosscourt rates higher · 0.27 pts
- Serve +1: mid-depth return to your middle hit BH through the middle ×4; BH crosscourt rates higher · 0.25 pts
- Serve +1: deep return to your middle hit FH through the middle ×4; FH crosscourt rates higher · 0.24 pts
- Return of a 1st serve, T, ad court hit FH down the line ×5; FH through the middle rates higher · 0.20 pts