US Open · QF · Hard · 3 Sep 2024
Grigor Dimitrov v Frances Tiafoe
107–130 in points · result not charted to completion
Why it went the way it did
Frances Tiafoe won 14.9 more points than Grigor Dimitrov relative to what the serve alone predicted. Grigor Dimitrov's biggest leaks: slice shot selection −8.5, return execution −5.6, forehand execution −4.4.
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 | Grigor Dimitrov | Frances Tiafoe | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | −0.3 | −0.2 | −4.2 | −4.8 | −0.4 | −0.2 | −5.5 | −6.1 |
| Serve 2nd | −0.1 | −0.1 | −3.7 | −3.9 | ±0.0 | −0.1 | −0.4 | −0.5 |
| Return | −0.1 | −2.7 | −5.6 | −8.3 | +0.2 | +0.8 | −3.4 | −2.3 |
| Forehand | −0.7 | +3.4 | −4.4 | −1.7 | −1.1 | +2.1 | +3.0 | +4.0 |
| Backhand | −1.3 | +1.0 | −0.9 | −1.1 | −0.5 | +0.3 | −0.4 | −0.5 |
| Slice | −0.7 | −8.5 | +2.6 | −6.6 | −0.2 | −3.4 | −0.2 | −3.7 |
| Net | +0.3 | +0.6 | −1.4 | −0.5 | −0.5 | −0.4 | −2.7 | −3.6 |
| Touch | ±0.0 | −0.5 | −0.2 | −0.8 | ±0.0 | −0.3 | +0.4 | +0.2 |
| All shots | −2.8 | −7.1 | −17.7 | −27.6 | −2.4 | −1.1 | −9.3 | −12.7 |
Set by set
| Set | Grigor Dimitrov | Frances Tiafoe | Net, Grigor | |
|---|---|---|---|---|
| 1 | −9.2 | −2.0 | −7.2 | |
| 2 | −3.8 | −5.7 | +1.8 | |
| 3 | −9.3 | −4.8 | −4.5 | |
| 4 | −5.3 | −0.3 | −5.0 |
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.
Grigor Dimitrov serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 44% 57% | 19% 22% | 38% 61% |
| 2 | 53% 57% | 8% 33% | 40% 81% |
| 3 | 48% 57% | 14% 25% | 38% 73% |
| 4 | 38% 80% | 15% 50% | 46% 33% |
Set to set +0.21 per 100 first serves in sets 2+
Within sets +0.50 per 100 first serves, every two to three service games
Frances Tiafoe serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 52% 75% | 13% 67% | 35% 63% |
| 2 | 39% 68% | 16% 63% | 45% 55% |
| 3 | 18% 75% | 23% 80% | 59% 77% |
| 4 | 15% 100% | 15% 100% | 69% 89% |
Set to set −0.84 per 100 first serves in sets 2+
Within sets −0.82 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.
Grigor Dimitrov
15.0 points left on the table across 489 shots 3.06 per 100 shots
- Rally, shots 5–8: drive to your backhand side hit BH slice through the middle ×11; BH slice crosscourt rates higher · 0.81 pts
- Rally, shots 5–8: drive to your backhand side hit BH through the middle ×14; BH crosscourt rates higher · 0.54 pts
- Serve +1: mid-depth return to your middle hit FH through the middle ×6; FH crosscourt rates higher · 0.52 pts
- Long rally, 9+: drive to your backhand side hit BH slice through the middle ×6; BH slice crosscourt rates higher · 0.42 pts
Frances Tiafoe
12.2 points left on the table across 477 shots 2.56 per 100 shots
- Rally, shots 5–8: drive to your forehand side, you at net hit FH volley through the middle ×2; FH volley crosscourt rates higher · 0.56 pts
- Rally, shots 5–8: drive to your middle, you at net hit FH volley through the middle ×2; FH volley crosscourt rates higher · 0.43 pts
- Rally, shots 5–8: drive to your forehand side hit FH through the middle ×6; FH crosscourt rates higher · 0.30 pts
- Return of a 2nd serve, body, ad court hit BH through the middle ×7; BH crosscourt rates higher · 0.29 pts