| Challenger de Porto | 06/29 10:00 | 25 | Tatsuma Ito v Aleksandar Vukic | Cancelled | |
| Wimbledon | 06/23 13:45 | 19 | [225] Tatsuma Ito v Jason Jung [159] | 2-6,1-6 | |
| Wimbledon | 06/22 11:35 | 14 | [182] Elias Ymer v Tatsuma Ito [225] | 3-6,4-6 | |
| ATP Halle | 06/12 09:00 | 14 | [90] Ilya Ivashka v Tatsuma Ito [222] | 6-1,6-3 | |
| Open de Francia | 05/24 20:30 | 14 | [221] Tatsuma Ito v Altug Celikbilek [238] | 3-6,6-4,5-7 | |
| Challenger de Zagreb | 05/10 10:25 | 19 | [185] Ernests Gulbis v Tatsuma Ito [221] | 7-6,1-6,6-4 | |
| Challenger de Zagreb | 05/09 13:50 | 14 | [267] Akira Santillan v Tatsuma Ito [216] | 4-6,3-6 | |
| Challenger de Biella | 05/02 11:00 | 14 | [213] Tatsuma Ito v Viktor Galovic [328] | 4-6,3-6 | |
| ATP Miami | 03/22 15:40 | 14 | [206] Tatsuma Ito v Ivo Karlovic [172] | 3-6,6-7 | |
| Challenger de Nur-Sultan | 03/03 05:50 | 26 | [203] Tatsuma Ito v Prajnesh Gunneswaran [134] | Retired | |
| Challenger de Nur-Sultan | 03/01 10:55 | 25 | [391] Denis Yevseyev v Tatsuma Ito [203] | 4-6,6-2,3-6 | |
| Challenger de Nur-Sultan | 02/25 07:10 | 26 | [152] Jurij Rodionov v Tatsuma Ito [204] | 6-3,6-2 | |
| Challenger de Nur-Sultan | 02/24 05:25 | 25 | [204] Tatsuma Ito v Vladyslav Manafov [250] | 6-4,6-4 | |
| Challenger de Estambul | 01/17 08:50 | 14 | [199] Ernesto Escobedo v Tatsuma Ito [189] | 6-1,4-6,6-4 | |
| Open de Australia | 01/11 10:20 | 60 | [189] Tatsuma Ito v Yannick Maden [171] | 4-6,2-6 | |
| Challenger Split | 09/29 11:20 | 25 | [192] Viktor Troicki v Tatsuma Ito [167] | 6-2,6-4 | |
| Open de Francia | 09/21 15:10 | 14 | [165] Tatsuma Ito v Nikola Milojevic [143] | 6-4,0-6,1-6 | |
| Challenger de Calgary | 02/26 01:25 | 25 | [457] Yusuke Takahashi v Tatsuma Ito [151] | 6-3,6-3 | |
| Challenger de Launceston | 02/04 01:00 | 25 | [372] Matias Franco Descotte v Tatsuma Ito [144] | 7-6,6-4 | |
| Open de Australia | 01/22 03:25 | 24 | [146] Tatsuma Ito v Novak Djokovic [2] | 1-6,4-6,2-6 | |
| Open de Australia | 01/20 23:30 | 23 | [146] Tatsuma Ito v Prajnesh Gunneswaran [123] | 6-4,6-2,7-5 | |
| ATP Auckland | 01/11 22:00 | 164 | [228] Michael Mmoh v Tatsuma Ito [145] | 6-2,6-2 | |
| ATP Auckland | 01/10 22:00 | 64 | [260] Shuichi Sekiguchi v Tatsuma Ito [145] | 3-6,6-4,4-6 | |
| Open de Australia - Comodín | 12/08 06:00 | 29 | [128] Jason Jung v Tatsuma Ito [148] | 5-7,4-6 | |
| Open de Australia - Comodín | 12/07 05:30 | 28 | [321] Yunseong Chung v Tatsuma Ito [148] | 6-1,4-6,4-6 | |
| Open de Australia - Comodín | 12/06 03:55 | 27 | [252] Ji Sung Nam v Tatsuma Ito [148] | 6-3,1-6,1-6 | |
| Open de Australia - Comodín | 12/04 03:35 | 26 | [453] Jumpei Yamasaki v Tatsuma Ito [148] | 2-6,2-6 | |
| Challenger de Kobe | 11/06 04:20 | 25 | [128] Tatsuma Ito v Chun Hsin Tseng [320] | Retired | |
| Challenger Playford 2 | 11/02 02:20 | 28 | [134] Tatsuma Ito v James Duckworth [130] | Retired | |
| Challenger Playford 2 | 11/01 01:50 | 27 | [162] Alex Bolt v Tatsuma Ito [134] | 5-7,4-6 |