BJK Cup Qualifiers · RR · Hard · 15 Apr 2022
Iga Swiatek v Mihaela Buzarnescu
53–22 in points · Iga Swiatek won
Why it went the way it did
Iga Swiatek won 15.0 more points than Mihaela Buzarnescu relative to what the serve alone predicted. Mihaela Buzarnescu's biggest leaks: forehand execution −5.0, net execution −1.2, touch shot selection −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 | Iga Swiatek | Mihaela Buzarnescu | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | +0.1 | ±0.0 | +1.1 | +1.2 | −0.3 | ±0.0 | −0.6 | −0.9 |
| Serve 2nd | −0.1 | ±0.0 | +0.3 | +0.2 | ±0.0 | ±0.0 | +0.3 | +0.2 |
| Return | ±0.0 | +0.4 | +0.3 | +0.7 | ±0.0 | ±0.0 | −0.2 | −0.2 |
| Forehand | +0.5 | +0.9 | +2.6 | +4.1 | −0.4 | +1.0 | −5.0 | −4.3 |
| Backhand | +0.1 | +0.3 | +1.8 | +2.3 | +0.1 | +0.1 | +0.1 | +0.3 |
| Slice | ±0.0 | −0.7 | +0.3 | −0.4 | ±0.0 | −0.7 | +0.2 | −0.5 |
| Net | −0.1 | +0.1 | −0.6 | −0.7 | +0.1 | +0.1 | −1.2 | −1.0 |
| Touch | ±0.0 | ±0.0 | ±0.0 | ±0.0 | +0.1 | −0.8 | −0.4 | −1.1 |
| All shots | +0.6 | +1.0 | +5.8 | +7.4 | −0.5 | −0.2 | −6.9 | −7.6 |
Set by set
| Set | Iga Swiatek | Mihaela Buzarnescu | Net, Iga | |
|---|---|---|---|---|
| 1 | +2.6 | −4.1 | +6.7 | |
| 2 | +4.8 | −3.5 | +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.
Iga Swiatek serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 58% 73% | 15% 50% | 27% 71% |
| 2 | 47% 86% | 20% 33% | 33% 100% |
Within sets −4.39 per 100 first serves, every two to three service games
Mihaela Buzarnescu serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 27% 50% | 33% 40% | 40% 17% |
| 2 | 32% 33% | 42% 38% | 26% 20% |
Within sets +1.39 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.
Iga Swiatek
2.6 points left on the table across 136 shots 1.95 per 100 shots
- Rally, shots 5–8: lob to your middle, you at net hit Smash through the middle ×1; Smash crosscourt rates higher · 0.25 pts
- Return +1: drive to your backhand side hit BH through the middle ×3; BH crosscourt rates higher · 0.14 pts
- Serve +1: mid-depth return to your backhand side hit BH through the middle ×2; BH down the line rates higher · 0.14 pts
- Return of a 1st serve, T, deuce court hit BH down the line ×2; BH through the middle rates higher · 0.14 pts
Mihaela Buzarnescu
4.0 points left on the table across 138 shots 2.91 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
- Return of a 1st serve, wide, ad court hit FH through the middle ×4; FH inside-out rates higher · 0.37 pts
- Return +1: drive to your middle hit FH through the middle ×4; FH down the line rates higher · 0.26 pts
- Return of a 1st serve, wide, ad court hit FH down the line ×1; FH inside-out rates higher · 0.17 pts