Washington · R32 · Hard · 30 Jul 2018
Belinda Bencic v Harriet Dart
77–64 in points · Belinda Bencic won
Why it went the way it did
Belinda Bencic won 6.0 more points than Harriet Dart relative to what the serve alone predicted. Harriet Dart's biggest leaks: backhand execution −6.6, touch shot selection −1.3, slice shot selection −1.2.
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 | Belinda Bencic | Harriet Dart | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | +0.1 | ±0.0 | −0.5 | −0.4 | −0.3 | ±0.0 | −0.6 | −0.9 |
| Serve 2nd | ±0.0 | ±0.0 | −0.6 | −0.7 | ±0.0 | ±0.0 | +0.4 | +0.3 |
| Return | +0.2 | −0.4 | +1.7 | +1.5 | +0.3 | −0.6 | +0.6 | +0.4 |
| Forehand | +0.6 | +0.9 | −3.0 | −1.5 | −0.1 | +1.5 | +3.6 | +5.0 |
| Backhand | +0.1 | −0.1 | +4.1 | +4.1 | +0.1 | +0.2 | −6.6 | −6.2 |
| Slice | +0.1 | −0.9 | ±0.0 | −0.9 | ±0.0 | −1.2 | +0.2 | −1.0 |
| Net | ±0.0 | +0.5 | +0.7 | +1.2 | +0.1 | +0.1 | −0.4 | −0.3 |
| Touch | ±0.0 | −0.8 | −0.2 | −1.1 | ±0.0 | −1.3 | +0.1 | −1.2 |
| All shots | +1.0 | −0.8 | +2.1 | +2.2 | +0.1 | −1.4 | −2.6 | −3.8 |
Set by set
| Set | Belinda Bencic | Harriet Dart | Net, Belinda | |
|---|---|---|---|---|
| 1 | +2.8 | +1.3 | +1.5 | |
| 2 | −0.6 | −5.1 | +4.6 |
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.
Belinda Bencic serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 41% 37% | 15% 14% | 43% 60% |
| 2 | 39% 73% | 18% 60% | 43% 67% |
Set to set −0.11 per 100 first serves in sets 2+
Within sets +0.31 per 100 first serves, every two to three service games
Harriet Dart serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 37% 29% | 29% 45% | 34% 38% |
| 2 | 28% 50% | 28% 50% | 45% 54% |
Set to set −0.20 per 100 first serves in sets 2+
Within sets +1.16 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.
Belinda Bencic
4.7 points left on the table across 233 shots 2.03 per 100 shots
- Long rally, 9+: drive to your middle hit FH through the middle ×4; FH down the line 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 · 0.21 pts
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×4; BH crosscourt rates higher · 0.17 pts
- Serve +1: mid-depth return to your middle hit FH through the middle ×2; FH crosscourt rates higher · 0.17 pts
Harriet Dart
5.7 points left on the table across 240 shots 2.40 per 100 shots
- Rally, shots 5–8: drive to your middle hit FH through the middle ×6; FH crosscourt rates higher · 0.42 pts
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×8; BH crosscourt rates higher · 0.34 pts
- Rally, shots 5–8: drive to your forehand side hit FH down the line ×15; FH crosscourt rates higher · 0.28 pts
- Return +1: drive to your middle hit FH through the middle ×4; FH down the line rates higher · 0.26 pts