18‑Dec‑2023 | M15 Yanagawa | Hard | R32 | 700 | 1022 | (Q)Koki Matsuda [JPN] d. (6)Sumizawa | 7-5 6-3 | | | | | | | | | |
27‑Nov‑2023 | M25 Gold Coast | Hard | R32 | 690 | 605 | (8)Matthew Dellavedova [AUS] d. Sumizawa | 7-6(7) 6-4 | | | | | | | | | |
20‑Nov‑2023 | M25 Brisbane | Hard | R32 | 690 | 1011 | (Q)Emile Hudd [GBR] d. Sumizawa | 6-2 6-2 | | | | | | | | | |
9‑Oct‑2023 | M25 Cairns | Hard | R16 | 724 | 315 | (1)Omar Jasika [AUS] d. Sumizawa | 6-1 6-2 | | | | | | | | | |
9‑Oct‑2023 | M25 Cairns | Hard | R32 | 724 | 1014 | Sumizawa d. Taiyo Yamanaka [JPN] | 6-2 6-2 | | | | | | | | | |
2‑Oct‑2023 | M25 Cairns | Hard | QF | 724 | 464 | (4)Ajeet Rai [NZL] d. (8)Sumizawa | 4-6 7-5 6-2 | | | | | | | | | |
2‑Oct‑2023 | M25 Cairns | Hard | R16 | 724 | 844 | (8)Sumizawa d. Kody Pearson [AUS] | 6-2 1-6 6-4 | | | | | | | | | |
2‑Oct‑2023 | M25 Cairns | Hard | R32 | 724 | 1236 | (8)Sumizawa d. (Q)Corban Crowther [NZL] | 7-6(9) 4-6 6-1 | | | | | | | | | |
18‑Sep‑2023 | M25 Takasaki | Hard | R16 | 726 | 394 | (1)Naoki Nakagawa [JPN] d. Sumizawa | 7-5 6-4 | | | | | | | | | |
18‑Sep‑2023 | M25 Takasaki | Hard | R32 | 726 | 798 | Sumizawa d. Takuya Kumasaka [JPN] | 6-0 1-0 RET | | | | | | | | | |
11‑Sep‑2023 | M25 Sapporo | Hard | R16 | 876 | 872 | Koki Matsuda [JPN] d. Sumizawa | 6-0 7-6(3) | | | | | | | | | |
11‑Sep‑2023 | M25 Sapporo | Hard | R32 | 876 | 783 | Sumizawa d. (8)Yunseok Jang [KOR] | 6-3 6-4 | | | | | | | | | |
4‑Sep‑2023 | M25 Sapporo | Hard | F | 832 | 621 | (4)Shuichi Sekiguchi [JPN] d. Sumizawa | 6-1 6-4 | | | | | | | | | |
4‑Sep‑2023 | M25 Sapporo | Hard | SF | 832 | 744 | Sumizawa d. (5)Sora Fukuda [JPN] | 6-4 6-4 | | | | | | | | | |
4‑Sep‑2023 | M25 Sapporo | Hard | QF | 832 | 1472 | Sumizawa d. (Q)Ko Suzuki [JPN] | 7-5 6-2 | | | | | | | | | |
4‑Sep‑2023 | M25 Sapporo | Hard | R16 | 832 | 1175 | Sumizawa d. (Q)Tomohiro Masabayashi [JPN] | 6-3 6-3 | | | | | | | | | |
4‑Sep‑2023 | M25 Sapporo | Hard | R32 | 832 | | Sumizawa d. (WC)Haruto Koyanagi [JPN] | 6-2 6-1 | | | | | | | | | |
28‑Aug‑2023 | M25 Hong Kong | Hard | R32 | 832 | 783 | Egor Gerasimov [BLR] d. (Q)Sumizawa | 4-6 6-3 7-5 | | | | | | | | | |
31‑Jul‑2023 | M15 Caloundra | Hard | QF | 874 | 339 | (2)Luke Saville [AUS] d. (7)Sumizawa | 6-4 6-4 | | | | | | | | | |
31‑Jul‑2023 | M15 Caloundra | Hard | R16 | 874 | | (7)Sumizawa d. (WC)Jeremy Zhang [AUS] | 6-2 6-1 | | | | | | | | | |
31‑Jul‑2023 | M15 Caloundra | Hard | R32 | 874 | 1025 | (7)Sumizawa d. Taiyo Yamanaka [JPN] | 4-6 6-3 7-6(1) | | | | | | | | | |
24‑Jul‑2023 | M15 Caloundra | Hard | QF | 728 | 408 | (3)Thomas Fancutt [AUS] d. (6)Sumizawa | 3-6 7-6(2) 6-3 | | | | | | | | | |
24‑Jul‑2023 | M15 Caloundra | Hard | R16 | 728 | | (6)Sumizawa d. (Q)Luke Sorensen [AUS] | 6-4 6-3 | | | | | | | | | |
24‑Jul‑2023 | M15 Caloundra | Hard | R32 | 728 | 912 | (6)Sumizawa d. Kazuki Nishiwaki [JPN] | 6-1 6-2 | | | | | | | | | |
26‑Jun‑2023 | M15 Jakarta | Hard | R32 | 737 | 1126 | (SE)Yurii Dzhavakian [UKR] d. (7)Sumizawa | 2-6 6-4 6-2 | | | | | | | | | |
19‑Jun‑2023 | M25 Anseong | Clay | QF | 738 | 858 | San Hui Sin [KOR] d. (8)Sumizawa | 6-3 6-4 | | | | | | | | | |
19‑Jun‑2023 | M25 Anseong | Clay | R16 | 738 | 812 | (8)Sumizawa d. Takuya Kumasaka [JPN] | 7-5 7-6(4) | | | | | | | | | |
19‑Jun‑2023 | M25 Anseong | Clay | R32 | 738 | 1443 | (8)Sumizawa d. (Q)Ko Suzuki [JPN] | 7-5 6-3 | | | | | | | | | |
12‑Jun‑2023 | M25 Nakhon Si Thammarat | Hard | R16 | 727 | 598 | Orel Kimhi [ISR] d. Sumizawa | 6-1 6-3 | | | | | | | | | |
12‑Jun‑2023 | M25 Nakhon Si Thammarat | Hard | R32 | 727 | 1322 | Sumizawa d. (Q)Arslanbek Aitkulov [KAZ] | 6-2 1-0 RET | | | | | | | | | |
5‑Jun‑2023 | M15 Nakhon Si Thammarat | Hard | R32 | 730 | 1060 | Maximus Jones [THA] d. (8)Sumizawa | 6-1 6-2 | | | | | | | | | |
29‑May‑2023 | M15 Karuizawa | Clay | R16 | 730 | 1069 | Sora Fukuda [JPN] d. (4)Sumizawa | 6-3 6-4 | | | | | | | | | |
29‑May‑2023 | M15 Karuizawa | Clay | R32 | 730 | 1231 | (4)Sumizawa d. Taketo Takamisawa [JPN] | 6-2 6-4 | | | | | | | | | |
8‑May‑2023 | Busan CH | Hard | Q1 | 729 | 1039 | (WC)Woobin Shin [KOR] d. (Alt)Sumizawa | 2-6 6-3 6-2 | | 0.94 | 3.9% | 6.5% | 57.1% | 68.2% | 54.5% | 5/8 | 2:01 |
1‑May‑2023 | Gwangju CH | Hard | Q1 | 724 | 271 | (2)Daniel Masur [GER] d. (Alt)Sumizawa | 6-0 6-4 | | 0.36 | 3.2% | 6.3% | 54.0% | 55.9% | 44.8% | 4/8 | 1:03 |
3‑Apr‑2023 | M25 Kashiwa | Hard | R16 | 737 | 351 | (7)Yunseong Chung [KOR] d. Sumizawa | 6-2 6-2 | | | | | | | | | |
3‑Apr‑2023 | M25 Kashiwa | Hard | R32 | 737 | 1472 | Sumizawa d. (Q)Ryotaro Taguchi [JPN] | 7-6(3) 6-7(3) 7-6(2) | | | | | | | | | |
27‑Mar‑2023 | M25 Tsukuba | Hard | R16 | 728 | 318 | (6)Hiroki Moriya [JPN] d. Sumizawa | 7-5 6-1 | | | | | | | | | |
27‑Mar‑2023 | M25 Tsukuba | Hard | R32 | 728 | 522 | Sumizawa d. Makoto Ochi [JPN] | 1-6 7-5 6-4 | | | | | | | | | |
20‑Mar‑2023 | M25 Canberra | Clay | R32 | 728 | 1170 | Jordan Smith [CAN] d. Sumizawa | 6-4 7-6(5) | | | | | | | | | |
13‑Mar‑2023 | M25 Canberra | Clay | R32 | 724 | 255 | (1)Dane Sweeny [AUS] d. Sumizawa | 7-6(4) 6-4 | | | | | | | | | |
6‑Feb‑2023 | M25 Burnie | Hard | R32 | 711 | 596 | Luke Saville [AUS] d. Sumizawa | 6-3 6-4 | | | | | | | | | |
30‑Jan‑2023 | Burnie CH | Hard | R32 | 747 | 319 | (7)Hiroki Moriya [JPN] d. (Q)Sumizawa | 6-3 6-3 | | 0.76 | 1.9% | 1.9% | 72.2% | 46.2% | 46.7% | 2/7 | 1:29 |
30‑Jan‑2023 | Burnie CH | Hard | Q2 | 747 | 1023 | (3)Sumizawa d. (8)Derek Pham [AUS] | 6-4 3-6 6-3 | | 1.07 | 1.1% | 3.4% | 59.1% | 63.5% | 38.9% | 4/10 | 2:33 |
30‑Jan‑2023 | Burnie CH | Hard | Q1 | 747 | 1304 | (3)Sumizawa d. (Alt)Zaharije Zak Talic [AUS] | 6-2 6-4 | | 1.64 | 8.7% | 8.7% | 60.9% | 78.6% | 61.1% | 2/3 | 1:12 |
2‑Jan‑2023 | Noumea CH | Hard | Q2 | 747 | 990 | (9)Jeremy Jin [AUS] d. (2)Sumizawa | 6-7(2) 6-3 7-5 | | 0.97 | 6.9% | 10.0% | 46.2% | 70.0% | 50.0% | 11/16 | 3:22 |