Toronto · R64 · Hard · 8 Aug 2022
Serena Williams v Nuria Parrizas Diaz
81–71 in points · Serena Williams won
Why it went the way it did
Serena Williams won 2.3 more points than Nuria Parrizas Diaz relative to what the serve alone predicted. Nuria Parrizas Diaz's biggest leaks: slice shot selection −1.3, return shot selection −1.0, serve 1st direction choices −0.8.
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 | Serena Williams | Nuria Parrizas Diaz | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | −0.5 | ±0.0 | +1.3 | +0.7 | −0.8 | ±0.0 | +0.2 | −0.6 |
| Serve 2nd | ±0.0 | ±0.0 | +0.4 | +0.4 | ±0.0 | ±0.0 | −0.8 | −0.8 |
| Return | +0.3 | +0.6 | −0.5 | +0.4 | −0.2 | −1.0 | +0.7 | −0.5 |
| Forehand | +0.3 | +1.5 | +2.1 | +3.9 | −0.6 | +1.2 | +3.0 | +3.6 |
| Backhand | +0.5 | +0.6 | +3.0 | +4.0 | +0.6 | +0.9 | +6.4 | +7.9 |
| Slice | −0.1 | −1.4 | −0.2 | −1.7 | −0.1 | −1.3 | −0.4 | −1.8 |
| Net | +0.2 | +0.7 | +0.5 | +1.4 | ±0.0 | ±0.0 | ±0.0 | ±0.0 |
| Touch | +0.1 | −0.4 | +0.8 | +0.5 | +0.1 | −0.7 | ±0.0 | −0.6 |
| All shots | +0.7 | +1.5 | +7.3 | +9.5 | −1.0 | −1.0 | +9.2 | +7.2 |
Set by set
| Set | Serena Williams | Nuria Parrizas Diaz | Net, Serena | |
|---|---|---|---|---|
| 1 | +3.1 | +1.2 | +1.8 | |
| 2 | +6.5 | +6.0 | +0.5 |
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.
Serena Williams serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 32% 58% | 42% 63% | 26% 50% |
| 2 | 32% 44% | 25% 79% | 43% 63% |
Set to set −1.01 per 100 first serves in sets 2+
Within sets −1.08 per 100 first serves, every two to three service games
Nuria Parrizas Diaz serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 45% 60% | 23% 0% | 32% 71% |
| 2 | 14% 80% | 64% 61% | 22% 50% |
Within sets −5.16 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.
Serena Williams
5.1 points left on the table across 289 shots 1.78 per 100 shots
- Return +1: drive to your middle hit FH through the middle ×5; FH down the line rates higher · 0.32 pts
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×7; BH crosscourt rates higher · 0.30 pts
- Rally, shots 5–8: drive to your middle hit FH through the middle ×4; FH crosscourt rates higher · 0.28 pts
- Rally, shots 5–8: drive to your forehand side hit FH through the middle ×5; FH crosscourt rates higher · 0.27 pts
Nuria Parrizas Diaz
7.4 points left on the table across 307 shots 2.41 per 100 shots
- Rally, shots 5–8: drive to your forehand side hit FH through the middle ×7; FH crosscourt rates higher · 0.38 pts
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×8; BH crosscourt rates higher · 0.34 pts
- Return +1: drive to your forehand side hit FH through the middle ×5; FH crosscourt rates higher · 0.32 pts
- Rally, shots 5–8: drive to your middle hit FH through the middle ×4; FH crosscourt rates higher · 0.28 pts