| Challenger Playford 2 | 10/30 01:20 | 25 | [402] Brydan Klein v Tatsuma Ito [134] | 4-6,4-6 | |
| Challenger de Traralgon | 10/26 06:15 | 28 | [189] Andrew Harris v Tatsuma Ito [137] | 4-6,7-6,7-6 | |
| Challenger de Traralgon | 10/24 23:00 | 27 | [229] Max Purcell v Tatsuma Ito [137] | 5-7,1-6 | |
| Challenger de Traralgon | 10/24 02:50 | 26 | [305] Harry Bourchier v Tatsuma Ito [137] | 4-6,6-4,3-6 | |
| Challenger de Traralgon | 10/22 23:00 | 25 | Bradley Mousley v Tatsuma Ito | 4-6,3-6 | |
| Challenger de Ningbo | 10/17 06:50 | 26 | [137] Tatsuma Ito v Frederico Ferreira Silva [223] | 4-6,6-7 | |
| Challenger de Ningbo | 10/16 05:10 | 25 | [137] Tatsuma Ito v Kaichi Uchida [292] | 3-6,6-3,6-4 | |
| Masters de Shanghái | 10/05 04:00 | 45 | [141] Tatsuma Ito v Damir Dzumhur [93] | 6-4,6-7,2-6 | |
| ATP Tokio | 09/29 02:00 | 164 | [79] John Millman v Tatsuma Ito [141] | 7-6,6-1 | |
| ATP Tokio | 09/28 03:25 | 64 | [141] Tatsuma Ito v Peter Gojowczyk [92] | 5-7,6-1,6-4 | |
| ATP Zhuhai | 09/23 08:25 | 25 | [141] Tatsuma Ito v Di Wu [339] | 6-3,3-6,5-7 | |
| ATP Zhuhai | 09/22 05:30 | 164 | [139] Tatsuma Ito v Jiri Vesely [131] | Retired | |
| ATP Zhuhai | 09/21 06:30 | 64 | [92] Thomas Fabbiano v Tatsuma Ito [139] | 4-6,3-6 | |
| Challenger de Shanghái | 09/12 04:20 | 26 | [396] Collin Altamirano v Tatsuma Ito [139] | 6-3,7-6 | |
| Challenger de Shanghái | 09/10 08:35 | 25 | [241] Sasikumar Mukund v Tatsuma Ito [139] | 4-6,4-6 | |
| Challenger de Jinan | 09/05 04:35 | 26 | [132] Tatsuma Ito v Teymuraz Gabashvili [352] | 5-7,3-6 | |
| Challenger de Jinan | 09/03 07:05 | 25 | [132] Tatsuma Ito v Baptiste Crepatte [277] | 6-4,6-0 | |
| US Open | 08/20 19:40 | 44 | [190] Sumit Nagal v Tatsuma Ito [133] | 7-6,6-2 | |
| Challenger de Yokkaichi | 08/10 04:25 | 28 | [143] Tatsuma Ito v James Duckworth [158] | 3-6,4-6 | |
| Challenger de Yokkaichi | 08/09 04:30 | 27 | [271] Saketh Myneni v Tatsuma Ito [143] | 6-7,1-6 | |
| Challenger de Yokkaichi | 08/08 08:10 | 26 | Shinji Hazawa v Tatsuma Ito | 0-6,3-6 | |
| Challenger de Yokkaichi | 08/07 08:15 | 25 | Kento Takeuchi v Tatsuma Ito | 6-7,1-6 | |
| Challenger de Chengdu | 08/03 05:30 | 28 | [154] Tatsuma Ito v Hyeon Chung [166] | 2-6,6-7 | |
| Challenger de Chengdu | 08/02 09:15 | 27 | [458] Shuichi Sekiguchi v Tatsuma Ito [154] | 2-6,1-6 | |
| Challenger de Chengdu | 08/01 06:15 | 26 | Matthew C Romios v Tatsuma Ito | 2-6,1-6 | |
| Challenger de Chengdu | 07/30 05:10 | 25 | [378] Makoto Ochi v Tatsuma Ito [154] | 4-6,3-6 | |
| ATP Newport | 07/14 15:00 | 64 | [156] Tatsuma Ito v John-Patrick Smith [224] | 2-6,6-3,3-6 | |
| Wimbledon | 06/24 15:05 | 44 | [228] Steven Diez v Tatsuma Ito [159] | 6-4,6-1 | |
| Challenger de Ilkley | 06/18 10:00 | 24 | [159] Tatsuma Ito v Ruben Bemelmans [175] | 7-6,3-6,4-6 | |
| Challenger de Nottingham | 06/14 11:00 | 26 | [158] Tatsuma Ito v Lukas Rosol [141] | 4-6,7-6,3-6 |