John Isner defeated Christopher O'Connell 7-6(5) 6-7(3) 6-4 in the 2021 Atlanta quarterfinal on hard courts.
Match Statistics
| Stat | John Isner | Christopher O'Connell |
| Aces | 30 | 16 |
| Double faults | 0 | 0 |
| First serve % | 77 | 70 |
| First serve points won % | 80 | 88 |
| Second serve points won % | 50 | 38 |
| Break points saved % | 100 | 83 |
| Break points converted % | 17 | 0 |
| Service points won % | 73 | 73 |
| Return points won % | 27 | 27 |
| Total points won % | 50 | 50 |
Player Comparison
| Field | John Isner | Christopher O'Connell |
| Country |
USA
|
AUS
|
| Birth date | Apr 26, 1985 | Jun 3, 1994 |
| Age | 36 | 27 |
| Height | 208 cm | 183 cm |
| Handedness | Right-Handed | Right-Handed |
| Backhand style | Two-Handed Backhand | — |
| Ranking (entering) | 35 | 132 |
| Ranking points (entering) | 1,718 | 632 |
| Elo (entering) | 1,894 | 1,679 |
| Current career W-L | 470–294 | 65–99 |
| Current career earnings | $22,433,361 | $4,554,886 |
Path
John Isner's path
John Isner's next match
Christopher O'Connell's path