US Open · R128 · Hard · 30 Aug 2022
John Isner v Federico Delbonis
87–61 in points · John Isner won
Why it went the way it did
John Isner won 13.6 more points than Federico Delbonis relative to what the serve alone predicted. Federico Delbonis's biggest leaks: forehand execution −3.0, slice execution −1.8, slice shot selection −1.6.
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 | John Isner | Federico Delbonis | ||||||
|---|---|---|---|---|---|---|---|---|
| Dir | Sel | Exec | Total | Dir | Sel | Exec | Total | |
| Serve 1st | +0.4 | ±0.0 | +9.9 | +10.3 | −0.2 | −0.1 | ±0.0 | −0.3 |
| Serve 2nd | +0.1 | +0.1 | +4.0 | +4.2 | −0.1 | ±0.0 | −0.5 | −0.6 |
| Return | −0.3 | +0.2 | +4.5 | +4.3 | −0.1 | −0.5 | +1.9 | +1.3 |
| Forehand | −0.6 | +0.4 | −1.0 | −1.2 | −1.4 | +1.2 | −3.0 | −3.2 |
| Backhand | +0.1 | −0.3 | −3.1 | −3.4 | −0.1 | −0.6 | +3.1 | +2.4 |
| Slice | −0.2 | −1.5 | −1.9 | −3.5 | −0.3 | −1.6 | −1.8 | −3.6 |
| Net | −0.2 | +0.1 | −0.2 | −0.3 | −0.1 | +0.2 | −0.7 | −0.6 |
| Touch | ±0.0 | ±0.0 | −0.5 | −0.5 | −0.1 | ±0.0 | +1.1 | +1.0 |
| All shots | −0.7 | −1.0 | +11.7 | +9.9 | −2.4 | −1.5 | +0.2 | −3.7 |
Set by set
| Set | John Isner | Federico Delbonis | Net, John | |
|---|---|---|---|---|
| 1 | +3.5 | −1.1 | +4.6 | |
| 2 | +2.7 | −4.3 | +7.0 | |
| 3 | +3.7 | +1.7 | +2.0 |
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.
John Isner serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 63% 80% | – | 38% 89% |
| 2 | 53% 67% | – | 47% 75% |
| 3 | 45% 57% | – | 55% 94% |
Set to set +0.22 per 100 first serves in sets 2+
Within sets −0.03 per 100 first serves, every two to three service games
Federico Delbonis serving
| Set | Wide | Body | T |
|---|---|---|---|
| 1 | 44% 73% | 16% 25% | 40% 70% |
| 2 | 40% 25% | 10% 100% | 50% 30% |
| 3 | 45% 86% | 13% 50% | 42% 62% |
Set to set −0.05 per 100 first serves in sets 2+
Within sets +0.55 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.
John Isner
5.1 points left on the table across 162 shots 3.17 per 100 shots
- Return +1: drive to your middle hit FH through the middle ×8; FH crosscourt rates higher · 0.47 pts
- Serve +1: drive to your middle hit FH slice through the middle ×3; FH slice down the line rates higher · 0.40 pts
- Return of a 2nd serve, wide, ad court hit BH through the middle ×5; BH crosscourt rates higher · 0.28 pts
- Return of a 1st serve, wide, ad court hit BH down the line ×3; BH crosscourt rates higher · 0.27 pts
Federico Delbonis
7.1 points left on the table across 147 shots 4.83 per 100 shots
- Serve +1: drive to your middle hit FH through the middle ×12; FH crosscourt rates higher · 1.49 pts
- Rally, shots 5–8: drive to your middle hit FH through the middle ×10; FH crosscourt rates higher · 0.57 pts
- Serve +1: drive to your middle hit BH through the middle ×5; BH crosscourt rates higher · 0.43 pts
- Return of a 1st serve, T, deuce court hit FH through the middle ×3; FH inside-out rates higher · 0.32 pts