[14] John Isner 5-7,6-3,6-7,4-6 Marin Cilic [23] 2019-08-31 18:40
Stadium: Grandstand Round: 25 Ground: Hardcourt outdoor
Head to Head
| ATP World Tour Finals | 2018/11/14 20:00 | Marin Cilic v John Isner | 6-7,6-3,6-4 |
| ATP Miami | 2018/03/27 15:00 | John Isner v Marin Cilic | 7-6,6-3 |
| ATP Queens | 2017/06/20 17:15 | Marin Cilic v John Isner | 7-5,6-3 |
| ATP Rome | 2017/05/19 10:00 | John Isner v Marin Cilic | 7-6,2-6,7-6 |
| ATP Paris | 2016/11/05 13:10 | Marin Cilic v John Isner | 4-6,3-6 |
| Davis Cup | 2016/07/17 19:00 | John Isner v Marin Cilic | 6-7,3-6,4-6 |
| Wimbledon | 2015/07/03 15:55 | Marin Cilic v John Isner | 7-6,6-7,6-4,6-7,12-10 |
| ATP Delray Beach | 2014/02/23 04:25 | Marin Cilic v John Isner | 7-6,6-3 |
Home History
| US Open | 2019/08/29 18:30 | John Isner v Jan-Lennard Struff | 6-3,7-6,7-6 |
| US Open | 2019/08/27 17:25 | John Isner v Guillermo Garcia-Lopez | 6-3,6-4,6-4 |
| ATP Cincinnati | 2019/08/14 02:30 | Pablo Carreno Busta v John Isner | 6-4,6-7,7-6 |
| ATP Cincinnati | 2019/08/11 23:00 | Dusan Lajovic v John Isner | 6-7,6-1,5-7 |
| ATP Montreal | 2019/08/07 21:15 | Cristian Garin v John Isner | 6-3,6-4 |
| ATP Montreal | 2019/08/06 16:00 | Jordan Thompson v John Isner | 6-3,3-6,6-7 |
| ATP Washington | 2019/08/02 00:00 | Benoit Paire v John Isner | 7-6,6-3 |
| ATP Washington | 2019/07/31 18:00 | Hubert Hurkacz v John Isner | 4-6,4-6 |
Away History
| US Open | 2019/08/30 01:35 | Cedrik-Marcel Stebe v Marin Cilic | 6-4,3-6,5-7,3-6 |
| US Open | 2019/08/27 16:25 | Martin Klizan v Marin Cilic | 3-6,2-6,6-7 |
| ATP Cincinnati | 2019/08/12 15:00 | Marin Cilic v Radu Albot | 4-6,6-7 |
| ATP Montreal | 2019/08/08 16:00 | Marin Cilic v Dominic Thiem | 6-7,4-6 |
| ATP Montreal | 2019/08/07 16:00 | Marin Cilic v John Millman | 6-3,6-4 |
| ATP Montreal | 2019/08/06 16:00 | Marin Cilic v Bradley Klahn | 6-3,7-6 |
| ATP Washington | 2019/08/02 20:15 | Marin Cilic v Daniil Medvedev | 4-6,6-7 |
| ATP Washington | 2019/08/01 20:30 | Marin Cilic v Felix Auger Aliassime | 6-3,6-4 |