| Davis Cup | 02/02 17:20 | 26 | Dusan Lajovic v John Isner | 4-6,7-6,3-6,6-3,6-7 | |
| Australian Open | 01/15 02:20 | 23 | Matthew Ebden v John Isner | 6-4,3-6,6-3,6-3 | |
| ATP Auckland | 01/10 07:25 | 26 | Hyeon Chung v John Isner | 7-6,5-7,6-2 | |
| ATP Paris | 11/04 13:00 | 28 | [77] Filip Krajinovic v John Isner [14] | 6-4,6-7,7-6 | |
| ATP Paris | 11/03 13:00 | 27 | [17] Juan Martin Del Potro v John Isner [14] | 4-6,7-6,4-6 | |
| ATP Paris | 11/02 13:40 | 26 | [14] John Isner v Grigor Dimitrov [8] | 7-6,5-7,7-6 | |
| ATP Paris | 11/01 10:00 | 25 | [14] John Isner v Diego Schwartzman [25] | 7-6,6-7,6-3 | |
| ATP Vienna | 10/23 15:00 | 25 | [34] Philipp Kohlschreiber v John Isner [13] | 7-6,6-4 | |
| ATP Shanghai | 10/12 13:25 | 26 | [54] Viktor Troicki v John Isner [16] | 6-4,7-6 | |
| ATP Shanghai | 10/11 12:20 | 25 | [131] Stefanos Tsitsipas v John Isner [16] | 6-7,6-7 | |
| ATP Shanghai | 10/10 05:00 | 24 | [73] Dusan Lajovic v John Isner [16] | 6-4,6-7,6-7 | |
| ATP Beijing | 10/06 06:30 | 27 | [1] Rafael Nadal v John Isner [17] | 6-4,7-6 | |
| ATP Beijing | 10/05 06:30 | 26 | [54] Leonardo Mayer v John Isner [17] | 0-6,3-6 | |
| ATP Beijing | 10/03 09:05 | 25 | [90] Malek Jaziri v John Isner [17] | 2-6,3-6 | |
| Laver Cup | 09/24 13:45 | 44 | [1] Rafael Nadal v John Isner [17] | 5-7,6-7 | |
| Laver Cup | 09/22 13:10 | 44 | [7] Dominic Thiem v John Isner [17] | 6-7,7-6,10-7 | |
| US Open | 09/01 23:00 | 25 | [27] Mischa Zverev v John Isner [15] | 6-4,6-3,7-6 | |
| US Open | 08/30 21:10 | 24 | [47] Hyeon Chung v John Isner [15] | 3-6,4-6,5-7 | |
| US Open | 08/28 17:00 | 23 | [65] Pierre-Hugues Herbert v John Isner [15] | 1-6,3-6,6-4,3-6 | |
| ATP Winston-Salem | 08/23 23:00 | 26 | [14] John Isner v Borna Coric [62] | 5-7,2-6 | |
| ATP Winston-Salem | 08/22 23:00 | 25 | [14] John Isner v Andrey Kuznetsov [70] | 2-6,7-6,6-3 | |
| ATP Cincinnati | 08/19 18:00 | 28 | [19] John Isner v Grigor Dimitrov [11] | 6-7,6-7 | |
| ATP Cincinnati | 08/18 21:20 | 27 | [60] Jared Donaldson v John Isner [19] | 6-7,5-7 | |
| ATP Cincinnati | 08/17 21:45 | 26 | [19] John Isner v Frances Tiafoe [87] | 7-6,7-5 | |
| ATP Cincinnati | 08/15 23:00 | 25 | [19] John Isner v Tommy Paul [175] | 6-3,6-3 | |
| ATP Cincinnati | 08/13 23:00 | 24 | [19] John Isner v Viktor Troicki [45] | 7-6,6-4 | |
| ATP Montreal | 08/07 22:30 | 24 | [31] Juan M Del Potro v John Isner [19] | 7-5,7-5 | |
| ATP Atlanta | 07/30 21:00 | 29 | [42] Ryan Harrison v John Isner [20] | 6-7,6-7 | |
| ATP Atlanta | 07/29 19:00 | 28 | [22] Gilles Muller v John Isner [20] | 4-6,2-6 | |
| ATP Atlanta | 07/28 18:10 | 27 | [129] Lukas Lacko v John Isner [20] | 5-7,4-6 |
Wikipedia - John Isner
John Robert Isner (born April 26, 1985) is an American former professional tennis player. He was ranked as high as world No. 8 in singles and No. 14 in doubles by the Association of Tennis Professionals (ATP).Considered one of the best servers ever to play on the ATP Tour, Isner achieved his career-high singles ranking in July 2018 by virtue of his first Masters 1000 crown at the 2018 Miami Open and a semifinal appearance at the 2018 Wimbledon Championships. He also twice reached the quarterfinals at the US Open in 2011 and 2018, the latter of which helped qualify him for an ATP Finals appearance later that year. At the 2010 Wimbledon Championships, he played the longest professional tennis match in history, requiring five sets and 183 games to defeat Nicolas Mahut in a match which lasted 11 hours and 5 minutes, and was played over the course of three days. Isner holds the record for hitting the ATP's fastest "official" serve ever and third-fastest on record in tennis at 157.2 mph or 253 km/h during his first-round 2016 Davis Cup match. He has the most aces in the history of the ATP Tour, having served 14,470, as of August 31, 2023. Isner retired from professional tennis following the 2023 US Open.