Wimbledon · R128 · Grass · 29 Jun 2021
Marta Kostyuk v Kiki Bertens
80–65 in points · Marta Kostyuk won
Why it went the way it did
Marta Kostyuk won 7.5 more points than Kiki Bertens relative to what the serve alone predicted. Kiki Bertens's biggest leaks: return execution −3.1, slice execution −2.5, slice shot selection −2.5.
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 | Marta Kostyuk | Kiki Bertens | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | ±0.0 | +0.1 | −0.4 | −0.3 | +0.4 | +0.2 | −0.7 | −0.1 |
| Serve 2nd | ±0.0 | ±0.0 | −0.4 | −0.4 | −0.1 | ±0.0 | −1.5 | −1.6 |
| Return | +0.3 | −0.2 | −1.3 | −1.3 | ±0.0 | −1.2 | −3.1 | −4.3 |
| Forehand | +0.3 | +2.3 | +2.6 | +5.2 | +0.4 | +3.8 | −0.1 | +4.1 |
| Backhand | −0.5 | +1.2 | −1.3 | −0.6 | −0.1 | +0.9 | +0.4 | +1.2 |
| Slice | +0.2 | −2.9 | +0.4 | −2.3 | −0.2 | −2.5 | −2.5 | −5.1 |
| Net | +0.1 | ±0.0 | −0.6 | −0.4 | +0.1 | +0.2 | −1.5 | −1.2 |
| Touch | +0.1 | +0.1 | +0.1 | +0.4 | ±0.0 | ±0.0 | −0.1 | −0.1 |
| All shots | +0.6 | +0.6 | −0.8 | +0.4 | +0.6 | +1.4 | −9.1 | −7.2 |
Set by set
| Set | Marta Kostyuk | Kiki Bertens | Net, Marta | |
|---|---|---|---|---|
| 1 | −2.0 | −6.8 | +4.8 | |
| 2 | +2.4 | −0.4 | +2.8 |
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.
Marta Kostyuk serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 36% 85% | 14% 20% | 50% 67% |
| 2 | 39% 54% | 21% 86% | 39% 77% |
Set to set +0.67 per 100 first serves in sets 2+
Within sets +1.22 per 100 first serves, every two to three service games
Kiki Bertens serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 59% 61% | 10% 50% | 31% 42% |
| 2 | 50% 61% | 8% 100% | 42% 53% |
Set to set −0.86 per 100 first serves in sets 2+
Within sets −0.53 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.
Marta Kostyuk
6.2 points left on the table across 231 shots 2.67 per 100 shots
- Rally, shots 5–8: drive to your forehand side hit FH through the middle ×8; FH crosscourt rates higher · 0.43 pts
- Return +1: drive to your backhand side, opponent at net hit BH through the middle ×3; BH crosscourt rates higher · 0.33 pts
- Rally, shots 5–8: slice to your middle, opponent at net hit BH through the middle ×1; BH down the line rates higher · 0.25 pts
- Rally, shots 5–8: volley to your backhand side, opponent at net hit BH through the middle ×1; BH crosscourt rates higher · 0.23 pts
Kiki Bertens
6.3 points left on the table across 240 shots 2.63 per 100 shots
- Rally, shots 5–8: drive to your backhand side hit BH slice down the line ×4; BH slice crosscourt rates higher · 0.35 pts
- Return of a 2nd serve, body, deuce court hit FH slice crosscourt ×2; FH slice through the middle rates higher · 0.31 pts
- Rally, shots 5–8: slice to your backhand side, you at net hit BH volley through the middle ×1; BH volley down the line rates higher · 0.30 pts
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×6; BH crosscourt rates higher · 0.26 pts