4‑Nov‑2019 | Kobe CH | Hard | R64 | 767 | 302 | Yosuke Watanuki [JPN] d. (LL)Nishiwaki | 6-3 6-4 | | 0.83 | 0.0% | 0.0% | 62.0% | 67.7% | 52.6% | 1/4 | 1:02 |
4‑Nov‑2019 | Kobe CH | Hard | Q1 | 767 | 1088 | Timur Khabibulin [KAZ] d. (1)Nishiwaki | 6-3 6-1 | | 0.53 | 11.1% | 5.6% | 61.1% | 66.7% | 33.3% | 4/8 | 0:56 |
7‑Oct‑2019 | M25 Tay Ninh | Hard | R16 | 867 | 1543 | Billy Harris [GBR] d. Nishiwaki | 6-4 6-4 | | | | | | | | | |
7‑Oct‑2019 | M25 Tay Ninh | Hard | R32 | 867 | 307 | Nishiwaki d. (3)Tsung Hua Yang [TPE] | 2-6 6-4 6-4 | | | | | | | | | |
30‑Sep‑2019 | M25 Tay Ninh | Hard | SF | 865 | 445 | Daniel Nguyen [USA] d. Nishiwaki | 6-2 6-3 | | | | | | | | | |
30‑Sep‑2019 | M25 Tay Ninh | Hard | QF | 865 | 439 | Nishiwaki d. Yusuke Takahashi [JPN] | 6-0 3-6 6-2 | | | | | | | | | |
30‑Sep‑2019 | M25 Tay Ninh | Hard | R16 | 865 | 949 | Nishiwaki d. Shao Fan Liu [TPE] | 4-6 6-2 6-3 | | | | | | | | | |
30‑Sep‑2019 | M25 Tay Ninh | Hard | R32 | 865 | 872 | Nishiwaki d. Chien Hsun Lo [TPE] | 6-3 6-4 | | | | | | | | | |
9‑Sep‑2019 | Shanghai CH | Hard | R64 | 857 | 460 | Jumpei Yamasaki [JPN] d. (Q)Nishiwaki | 6-3 6-2 | | 0.58 | 7.0% | 0.0% | 59.6% | 50.0% | 47.8% | 3/7 | 1:13 |
9‑Sep‑2019 | Shanghai CH | Hard | Q1 | 857 | 998 | (2)Nishiwaki d. N Sriram Balaji [IND] | 6-4 6-3 | | 1.24 | 7.5% | 6.0% | 55.2% | 70.3% | 60.0% | 3/4 | 1:28 |
19‑Aug‑2019 | M15 Cancun | Hard | R32 | 786 | 683 | Jose Olivares [DOM] d. Nishiwaki | 6-3 3-6 6-0 | | | | | | | | | |
5‑Aug‑2019 | Yokkaichi CH | Hard | R32 | 839 | 470 | (14)Yusuke Takahashi [JPN] d. Nishiwaki | 7-5 3-6 6-3 | | 0.90 | 3.2% | 3.2% | 53.8% | 74.0% | 44.2% | 4/8 | 2:13 |
5‑Aug‑2019 | Yokkaichi CH | Hard | R64 | 839 | 1607 | Nishiwaki d. (Alt)Courtney John Lock [ZIM] | 6-2 6-2 | | 1.28 | 7.6% | 4.5% | 50.0% | 78.8% | 48.5% | 10/10 | 1:25 |
10‑Jun‑2019 | M15 Singapore | Hard | SF | | | (4)Jonathan Gray [GBR] d. Nishiwaki | 6-3 7-5 | | | | | | | | | |
10‑Jun‑2019 | M15 Singapore | Hard | QF | | | Nishiwaki d. Benard Bruno Nkomba [AUS] | 6-3 6-0 | | | | | | | | | |
10‑Jun‑2019 | M15 Singapore | Hard | R16 | | | Nishiwaki d. Abhinav Sanjeev Shanmugam [IND] | 7-6(4) 6-2 | | | | | | | | | |
10‑Jun‑2019 | M15 Singapore | Hard | R32 | | | Nishiwaki d. (WC)Gauthier Onclin [BEL] | 6-0 6-1 | | | | | | | | | |
3‑Jun‑2019 | M15 Singapore | Hard | R32 | | | Cameron Green [AUS] d. Nishiwaki | 7-6(3) 6-1 | | | | | | | | | |
27‑May‑2019 | M15 Singapore | Hard | R32 | | | Maksim Tikhomirov [USA] d. Nishiwaki | 6-3 6-4 | | | | | | | | | |
29‑Apr‑2019 | M15 Wuhan | Hard | R16 | | 661 | (8)Sora Fukuda [JPN] d. Nishiwaki | 6-2 6-1 | | | | | | | | | |
29‑Apr‑2019 | M15 Wuhan | Hard | R32 | | 684 | Nishiwaki d. Xin Gao [CHN] | 2-6 6-3 6-3 | | | | | | | | | |
8‑Apr‑2019 | M25 Matsuyama | Hard | R32 | | | Rinky Hijikata [AUS] d. Nishiwaki | 6-3 6-4 | | | | | | | | | |
25‑Mar‑2019 | M15 Tsukuba | Hard | R32 | | 355 | Makoto Ochi [JPN] d. Nishiwaki | 6-3 6-1 | | | | | | | | | |
18‑Mar‑2019 | M15 Kofu | Hard | R32 | | | Mick Veldheer [NED] d. Nishiwaki | 4-6 6-1 6-4 | | | | | | | | | |
4‑Mar‑2019 | M15 Nishi Tama | Hard | R16 | | 365 | (2)Ji Sung Nam [KOR] d. Nishiwaki | W/O | | | | | | | | | |
4‑Mar‑2019 | M15 Nishi Tama | Hard | R32 | | | Nishiwaki d. Kaito Uesugi [JPN] | 5-0 RET | | | | | | | | | |
7‑Jan‑2019 | M15 Anning | Clay | SF | | 563 | (2)Agustin Velotti [ARG] d. Nishiwaki | 7-6(1) 6-2 | | | | | | | | | |
7‑Jan‑2019 | M15 Anning | Clay | QF | | | Nishiwaki d. Nitin Kumar Sinha [IND] | 6-7(3) 6-2 6-4 | | | | | | | | | |
7‑Jan‑2019 | M15 Anning | Clay | R16 | | | Nishiwaki d. Taisei Ichikawa [JPN] | 7-5 6-3 | | | | | | | | | |
7‑Jan‑2019 | M15 Anning | Clay | R32 | | | Nishiwaki d. (WC)Tianjia Guo [CHN] | 6-1 6-1 | | | | | | | | | |
31‑Dec‑2018 | M15 Anning | Clay | R16 | | | Eric Vanshelboim [UKR] d. (8)Nishiwaki | 4-6 6-1 6-4 | | | | | | | | | |
31‑Dec‑2018 | M15 Anning | Clay | R32 | | | (8)Nishiwaki d. Ruixuan Wang [CHN] | 1-6 6-2 6-4 | | | | | | | | | |