Stadium: Court 3 Round: 26 Ground: Hardcourt outdoor
| UTR Pro Tennis Series Miki | 2022/12/11 00:30 | 니시와키, 카즈키 v Ryotaro Taguchi | 6-3,6-4 |
| Kashiwa, Singles Qualifying M-ITF-JPN-05A | 2024/04/02 02:10 | 마츠이, 토시히데 v 니시와키, 카즈키 | 7-6,4-6,4-6 |
| Tsukuba, Singles Qualifying M-ITF-JPN-04A | 2024/03/27 00:50 | Yi Zhou v 니시와키, 카즈키 | 4-6,6-4,6-3 |
| Nishi-Tokyo, Singles M-ITF-JPN-02A | 2024/03/20 06:30 | Leo Vithoontien v 니시와키, 카즈키 | 6-2,6-3 |
| ITF M15 Torello | 2024/03/07 11:40 | 니시와키, 카즈키 v 키르킨, 이어지 | 1-6,1-6 |
| ITF M15 Torello | 2024/03/06 12:40 | 니시와키, 카즈키 v Manel L Juncadella | 6-4,6-2 |
| ITF M15 Villena | 2024/02/27 12:00 | 타바코, 파우스토 v 니시와키, 카즈키 | 6-3,6-1 |
| ITF M15 Yanagawa | 2023/12/26 03:25 | 니시와키, 카즈키 v 야마사키, 점페이 | 3-6,3-6 |
| Challenger Yokkaichi | 2023/11/26 04:20 | 푸테르길, 칼룸 v 니시와키, 카즈키 | 7-5,6-2 |
| Kashiwa, Singles Qualifying M-ITF-JPN-05A | 2024/04/03 01:00 | Ryotaro Taguchi v 야마나카, 타이요 | 6-1,6-4 |
| Kashiwa, Singles Qualifying M-ITF-JPN-05A | 2024/04/01 04:40 | Ryotaro Taguchi v 오구라, 코스케 | 6-1,6-2 |
| Kashiwa, Singles Qualifying M-ITF-JPN-05A | 2024/03/31 01:00 | Ryotaro Taguchi v Mattias Southcombe | 6-2,6-2 |
| Tsukuba, Singles Qualifying M-ITF-JPN-04A | 2024/03/28 03:20 | Ryotaro Taguchi v 신, 산후이 | 6-4,2-6,3-6 |
| Tsukuba, Singles Qualifying M-ITF-JPN-04A | 2024/03/27 06:35 | Jangjun Kim v Ryotaro Taguchi | 2-6,0-6 |
| Tsukuba, Singles Qualifying M-ITF-JPN-04A | 2024/03/25 06:00 | Ryotaro Taguchi v Koki Matsuda | 7-6,6-2 |
| Nishi-Tokyo, Singles M-ITF-JPN-02A | 2024/03/23 01:40 | Ryotaro Taguchi v 시라이시, 히카루 | 2-6,6-4,4-6 |
| Nishi-Tokyo, Singles M-ITF-JPN-02A | 2024/03/22 00:45 | 바이, 이앤 v Ryotaro Taguchi | 3-6,5-7 |