Miami · R128 · Hard · 19 Mar 2026
Katie Volynets v Tereza Valentova
49–62 in points · Tereza Valentova won
Why it went the way it did
Tereza Valentova won 7.2 more points than Katie Volynets relative to what the serve alone predicted. Katie Volynets's biggest leaks: slice shot selection −2.3, forehand execution −1.0, touch execution −0.6.
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 | Katie Volynets | Tereza Valentova | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | ±0.0 | ±0.0 | +1.5 | +1.5 | +0.3 | ±0.0 | +0.2 | +0.4 |
| Serve 2nd | ±0.0 | ±0.0 | −0.3 | −0.3 | −0.1 | ±0.0 | +1.4 | +1.3 |
| Return | ±0.0 | +0.5 | +2.6 | +3.1 | −0.3 | +0.3 | +4.5 | +4.6 |
| Forehand | ±0.0 | +1.5 | −1.0 | +0.5 | +0.1 | +2.2 | +5.4 | +7.7 |
| Backhand | −0.3 | +1.1 | +0.4 | +1.2 | −0.2 | +0.5 | −2.1 | −1.8 |
| Slice | −0.2 | −2.3 | +0.8 | −1.6 | +0.2 | −1.8 | +0.7 | −0.9 |
| Net | +0.2 | +0.3 | +0.5 | +1.0 | +0.1 | +0.6 | −0.5 | +0.3 |
| Touch | −0.2 | −0.6 | −0.6 | −1.4 | −0.2 | −0.5 | +0.3 | −0.5 |
| All shots | −0.5 | +0.5 | +4.0 | +4.0 | −0.2 | +1.3 | +10.0 | +11.1 |
Set by set
| Set | Katie Volynets | Tereza Valentova | Net, Katie | |
|---|---|---|---|---|
| 1 | −1.2 | +3.3 | −4.6 | |
| 2 | +5.2 | +7.8 | −2.6 |
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.
Katie Volynets serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 23% 40% | 27% 50% | 50% 64% |
| 2 | 39% 53% | 13% 60% | 47% 50% |
Within sets −0.23 per 100 first serves, every two to three service games
Tereza Valentova serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 38% 75% | 5% 100% | 57% 75% |
| 2 | 57% 65% | 10% 67% | 33% 50% |
Within sets +0.28 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.
Katie Volynets
6.8 points left on the table across 232 shots 2.92 per 100 shots
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×7; BH crosscourt rates higher · 0.30 pts
- Serve +1: mid-depth return to your middle hit FH through the middle ×3; FH crosscourt rates higher · 0.25 pts
- Return +1: drive to your backhand side hit BH through the middle ×5; BH crosscourt rates higher · 0.24 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
Tereza Valentova
6.5 points left on the table across 247 shots 2.64 per 100 shots
- Return +1: drive to your backhand side hit BH through the middle ×6; BH crosscourt rates higher · 0.29 pts
- Serve +1: mid-depth return to your middle hit FH through the middle ×3; FH crosscourt rates higher · 0.25 pts
- Serve +1: deep return to your middle hit FH through the middle ×4; FH crosscourt rates higher · 0.24 pts
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×5; BH crosscourt rates higher · 0.21 pts