Wimbledon · R128 · Grass · 2 Jul 2019
Ashleigh Barty v Saisai Zheng
68–44 in points · Ashleigh Barty won
Why it went the way it did
Ashleigh Barty won 12.8 more points than Saisai Zheng relative to what the serve alone predicted. Saisai Zheng's biggest leaks: forehand execution −5.7, slice shot selection −3.6, return shot selection −1.1.
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 | Ashleigh Barty | Saisai Zheng | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | +0.4 | ±0.0 | −1.8 | −1.4 | −0.1 | ±0.0 | −0.7 | −0.8 |
| Serve 2nd | −0.2 | ±0.0 | −0.4 | −0.6 | −0.2 | ±0.0 | −0.4 | −0.6 |
| Return | +0.2 | −0.2 | +2.2 | +2.1 | −0.1 | −1.1 | −0.7 | −1.8 |
| Forehand | +0.6 | +2.5 | −0.3 | +2.8 | −0.5 | +2.0 | −5.7 | −4.2 |
| Backhand | ±0.0 | +0.9 | +1.2 | +2.1 | ±0.0 | +1.4 | +0.5 | +1.8 |
| Slice | +0.7 | −5.0 | +1.7 | −2.6 | +0.4 | −3.6 | −0.1 | −3.3 |
| Net | +0.1 | +0.2 | +0.6 | +0.9 | +0.1 | +0.3 | +1.0 | +1.4 |
| Touch | ±0.0 | −0.5 | +0.9 | +0.4 | −0.2 | −0.3 | −1.0 | −1.6 |
| All shots | +1.6 | −2.2 | +4.2 | +3.6 | −0.7 | −1.4 | −7.0 | −9.1 |
Set by set
| Set | Ashleigh Barty | Saisai Zheng | Net, Ashleigh | |
|---|---|---|---|---|
| 1 | +0.5 | −3.9 | +4.5 | |
| 2 | +3.1 | −5.2 | +8.3 |
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.
Ashleigh Barty serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 47% 56% | 6% 100% | 47% 69% |
| 2 | 44% 100% | 6% 100% | 50% 78% |
Set to set +0.12 per 100 first serves in sets 2+
Within sets +0.13 per 100 first serves, every two to three service games
Saisai Zheng serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 46% 38% | 21% 50% | 32% 67% |
| 2 | 44% 29% | 28% 56% | 28% 78% |
Set to set −0.08 per 100 first serves in sets 2+
Within sets −1.35 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.
Ashleigh Barty
5.8 points left on the table across 249 shots 2.34 per 100 shots
- Return of a 1st serve, T, deuce court hit BH down the line ×4; BH through the middle rates higher · 0.34 pts
- Return +1: drive to your backhand side hit BH slice down the line ×3; BH slice crosscourt rates higher · 0.33 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
- Return +1: drive to your backhand side, opponent at net hit BH lob through the middle ×3; BH lob crosscourt rates higher · 0.28 pts
Saisai Zheng
6.8 points left on the table across 249 shots 2.71 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
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×8; BH crosscourt rates higher · 0.34 pts
- Long rally, 9+: slice to your forehand side, opponent at net hit FH through the middle ×2; FH crosscourt rates higher · 0.30 pts
- Return +1: drive to your forehand side hit FH through the middle ×4; FH crosscourt rates higher · 0.25 pts