| Challenger - Astana | 07/23 08:20 | 14 | Arslanbek Aitkulov v Denis Istomin | 6-2,6-4 | |
| Challenger - Rome | 04/24 09:10 | 19 | [435] Denis Istomin v Francesco Forti [357] | 1-6,3-6 | |
| Challenger - Rome | 04/23 08:00 | 14 | Sebastian Fanselow v Denis Istomin | 4-6,6-4,3-6 | |
| Challenger - Maia | 11/29 14:55 | 25 | [93] Nuno Borges v Denis Istomin [481] | 6-3,6-0 | |
| Challenger - Maia | 11/28 13:20 | 19 | [293] Denis Yevseyev v Denis Istomin [481] | 3-6,3-6 | |
| Challenger - Maia | 11/27 14:05 | 14 | Guilherme Valdoleiros v Denis Istomin | 1-6,1-6 | |
| Challenger - Andria | 11/20 15:10 | 14 | [478] Denis Istomin v David Poljak [442] | 2-6,3-6 | |
| Challenger - Bratislava | 11/06 13:10 | 14 | [447] Denis Istomin v Cem Ilkel [318] | 6-7,5-7 | |
| Challenger - Ortisei | 10/23 08:00 | 14 | [445] Denis Istomin v Andrew Paulson [374] | 4-6,4-6 | |
| ATP - Nur-Sultan | 10/01 08:30 | 14 | [72] Laslo Djere v Denis Istomin [424] | 6-1,6-4 | |
| Davis Cup | 09/17 14:40 | 5 | Denis Istomin v Shintaro Mochizuki | Cancelled | |
| Davis Cup | 09/16 06:00 | 1 | [420] Denis Istomin v Sho Shimabukuro [353] | 6-3,6-7,6-7 | |
| Challenger - Nonthaburi | 09/09 03:00 | 26 | [435] Denis Istomin v Omar Jasika [367] | 4-6,3-6 | |
| Challenger - Nonthaburi | 09/06 05:30 | 25 | [326] Dane Sweeny v Denis Istomin [435] | 2-6,3-6 | |
| Challenger - Nonthaburi - Kwal. | 08/28 09:20 | 14 | [499] Timo Legout v Denis Istomin [430] | 6-4,6-4 | |
| Challenger - Nonthaburi | 08/21 06:00 | 14 | [428] Denis Istomin v Dayne Kelly [479] | 3-6,0-6 | |
| Challenger - Segovia | 07/26 11:10 | 25 | [345] Alibek Kachmazov v Denis Istomin [438] | 0-6,6-4,7-6 | |
| Challenger - Segovia | 07/25 13:10 | 19 | [386] Elmar Ejupovic v Denis Istomin [438] | 6-2,6-7,4-6 | |
| Challenger - Segovia | 07/24 16:15 | 14 | [499] Wilson Leite v Denis Istomin [449] | 7-5,5-7,5-7 | |
| Challenger - Nur-Sultan | 07/22 07:10 | 27 | [449] Denis Istomin v Beibit Zhukayev [375] | 7-6,6-7,6-7 | |
| Challenger - Nur-Sultan | 07/20 07:05 | 26 | [288] Illya Marchenko v Denis Istomin [449] | 4-6,6-7 | |
| Challenger - Nur-Sultan | 07/19 05:45 | 25 | [441] Yan Bondarevskiy v Denis Istomin [449] | 3-6,6-3,2-6 | |
| Challenger - Porto | 07/03 17:05 | 14 | Thomaz Bellucci v Denis Istomin | 6-1,6-3 | |
| Challenger - Malaga | 06/26 14:45 | 14 | Denis Istomin v Alejandro T Alvarez | 6-1,6-7,3-6 | |
| Challenger - Shymkent | 05/17 05:55 | 25 | [318] Sebastian Fanselow v Denis Istomin [303] | 6-1,6-4 | |
| Challenger - Shymkent | 05/10 11:55 | 25 | [495] Evan Zhu v Denis Istomin [299] | 6-1,3-6,6-1 | |
| Challenger - Morelos | 04/25 21:35 | 25 | [141] Ernesto Escobedo v Denis Istomin [283] | 6-4,6-4 | |
| Challenger - Aguascalientes | 04/21 16:00 | 26 | [185] Federico Gaio v Denis Istomin [286] | 6-4,6-2 | |
| Challenger - Aguascalientes | 04/19 20:30 | 25 | [310] Antoine Bellier v Denis Istomin [286] | 6-7,7-5,3-6 | |
| Challenger - San Luis Potosi | 04/13 21:45 | 26 | [296] Denis Istomin v Ernesto Escobedo [143] | 4-6,6-4,3-6 |
Wikipedia - Denis Istomin
Denis Olegovitsj Istomin (Russisch: Денис Олегович Истомин) (Orenburg, 7 september 1986) is een Oezbeeks tennisser. Hij is prof sinds 2001 en haalde in 2009 voor het eerst de top 100. Zijn hoogste plaats op de ATP-ranglijst is de 33e, die hij behaalde op 13 augustus 2012.
Istomin haalde vijf keer de finale van een ATP-toernooi, waarvan hij er twee kon winnen. Hij heeft in het enkelspel wel twaalf challengers op zijn naam staan. Zijn beste resultaat in het enkelspel op een grandslamtoernooi is de vierde ronde. In augustus 2018 won Istomin het tennistoernooi van de Aziatische Spelen 2018.