Akira (小澤晶) Ozawa

Born : 1959 Cat. M65 Ultrarunner since 2014

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details

Countries visited ?

Japan

24,1%

Rank quotient ?This runner's calculation uses 97 eligible race(s): Σ(rank − 1) = 12 063; Σ finishers = 50 081. 12 063 / 50 081 × 100 = 24.09%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed100

Km — ultra races10 893 km

> 100 km35

> 160 km10

> 200 km6

Longest race266,0 km

6th Michinoku Tsugaru Journey Run 263K — 16/7/2022

Km per year (ultra races)

1 516

2022

757

2023

1 274

2024

843

2025

769

2026

Race types (share of distance)

Road86,0%

Trail11,0%

Stage3,1%

Records

50 km7h52'59 100 km9h24'22 50 mi10h37'26 100 mi25h34'47

HISTORY

98 race(s) · 4 stage(s) nested

Date		Race	Perf.	Rk
2026
17.05	100km	32th Yatsugatake Nobeyama 100 km	13:43:31 h	995
03.05	259km	21st River Road Foot Race 259km	2d 06:44:44 h	40
11.04	60km	21st Toda Saiko 60 km	6:15:05 h	39
14.03	200km	16th Little Edo Oedo 200k	33:14:26 h	131
28.02–01.03	150km/2stages	3rd Modern Japanese Silk Road Journey Run	20:31:26 h	24
28.02	78.2km	3rd Modern Japanese Silk Road Journey Run - Stage 1	9:42:47 h	25
01.03	71.7km	3rd Modern Japanese Silk Road Journey Run - Stage 2	10:48:39 h	26
2025
21.12	100km	8th Okinawa 100km Ultramarathon	10:56:21 h	123
01–02.11	130km/2stages	3rd Mito Kaido Journey run	17:02:16 h	11
01.11	62.2km	3rd Mito Kaido Journey run - Stage 1	8:19:35 h	18
02.11	68.1km	3rd Mito Kaido Journey run - Stage 2	8:42:41 h	13
28.09	100km	33. Akita Nairiku 100km Marathon	10:29:43 h	74
14.09	122km	8th Utsukushima Fukushima Journey Run 122K	18:21:26 h	7
06.07	80km	12th Naeba-Sanroku Geopark Tsunan Ultramarathon 80K	10:37:26 h	17
17.05	100km	10th Trainic World 100 km in Sai-No-Kuni	29:30:43 h	240
20.04	111km	6th Yamadera Zao 111 km Ultra Marathon	12:51:46 h	10
12.04	100km	4th Yagurazawa Round Trip Pre-Tournament	15:53:04 h	11
2024
15.12	100km	7th Okinawa 100km Ultramarathon	10:46:22 h	96
02.11	142km	6th Autumn leaves in Okumusashi / Chichibu Journey run	19:39:24 h	14
20.10	70km	31. Ultramarathon Okumusashi	7:44:24 h	138
13.10	100km	15th Echigo Kubikino 100km Ultramarathon	10:39:52 h	113
14.09	122km	7th Utsukushima Fukushima Journey Run 122K	17:12:33 h	7
13.07	154km	8th Michinoku Tsugaru Journey Run 154K	27:28:35 h	46
08.06	159km	5th Nikko Sennin Concentric Highway Journey Run	25:34:47 h	21
18.05	109.2km	9th Trainic World 100 km in Sai-No-Kuni	26:09:02 h	118
21.04	118km	34th Fuji 5 Lakes 118 km Challenge	13:54:57 h	181
06.04	100km	3rd Yagurazawa Round Trip Pre-Tournament	15:23:14 h	5
10.03	100km	6th Ibaraki 100k Ultra Marathon	9:39:31 h	53
2023
03.12	51.4km	11th Trainic world Ogose-Tokigawa Trail Run 50km	8:21:16 h	94
24.09	100km	31. Akita Nairiku 100km Marathon	10:22:28 h	68
01.07	8h	29th 8-Hour Endurance Race Tokorozawa	73.500 km	14
04.06	78km	30. Ultramarathon Okumusashi	11:39:13 h	768
23.04	100km	4th Yamadera Zao 100 km Ultra Marathon	12:25:34 h	27
15.04	100km	2nd Yagurazawa Round Trip Pre-Tournament	16:53:38 h	9
19.03	54.2km	11th Arakawa Riverside Journey Stage Race - Stage 2	6:01:34 h	14
11.03	200km	13th Little Edo Oedo 200k	32:53:04 h	105
2022
15.10	150km	1st Yagurazawa Round Trip Pre-Tournament	25:28:47 h	18
09.10	100km	14th Echigo Kubikino 100km Ultramarathon	9:53:41 h	66
25.09	100km	30. Akita Nairiku 100km Marathon	9:44:30 h	40
16.07	266km	6th Michinoku Tsugaru Journey Run 263K	47:40:55 h	29
03.07	8h	28th 8-Hour Endurance Race Tokorozawa	68.600 km	59
18.06	159km	3rd Nikko Sennin Concentric Highway Journey Run	26:34:00 h	18
05.06	78km	29. Ultramarathon Okumusashi	8:15:10 h	179
21.05	109.2km	7th Trainic World 100 km in Sai-No-Kuni	27:52:40 h	212
24.04	100km	3rd Yamadera Zao 100 km Ultra Marathon	18:37:03 h	65
02.04	155km	2nd Tone River Run Up Journey Run Downstream	19:43:00 h	5
12.03	230km	12th Little Edo Oedo 230k	34:21:23 h	23
2021
30.10	146km	3rd Autumn leaves in Okumusashi / Chichibu Journey run	17:49:07 h	23
16.10	120km	1st Tone River Run Up Journey Run Upstream	15:14:00 h	9
09.10	155km	1st Tone River Run Up Journey Run Downstream	22:07:00 h	11
17.07	117km	1st Nakasendo Ultra	22:23:00 h	17
04.07	8h	27th 8-Hour Endurance Race Tokorozawa	83.300 km	45
10.04	70km	16th Toda Saiko 70 km	6:10:51 h	71
04.04	56km	9th Arakawa Riverside Journey - 56 km	6:15:00 h	7
27.02	200km	11th Little Edo Oedo 200k	29:01:41 h	29
2020
24.10	146km	2nd Autumn leaves in Okumusashi / Chichibu Journey run	18:20:03 h	25
20.09	127km	3rd Utsukushima Fukushima Journey Run 127K	16:39:11 h	19
22.08	63.7km	1st Toda Aya Lake Ultra Marathon	6:07:08 h	13
05.07	8h	26th 8-Hour Endurance Race Tokorozawa	83.300 km	21
2019
02.11	145km	1st Autumn leaves in Okumusashi / Chichibu Journey run	18:32:39 h	16
07.10	100km	1st Fuji 4 Lakes 100 km Autumn Challenge	10:20:58 h	56
22.09	100km	29. Akita Nairiku 100km Marathon	9:53:56 h	65
30.06	100km	34. Lake Saroma 100 km Ultramarathon	9:37:37 h	265
29.06	8h	25th 8-Hour Endurance Race Tokorozawa	78.400 km	34
15.06	161.6km	1st Nikko Sennin Concentric Journey Run	26:02:55 h	30
02.06	78km	26. Ultramarathon Okumusashi	9:28:53 h	663
11.05	106km	4th Trainic World 100 km in Sai-No-Kuni	26:26:32 h	117
24.03	100km	1st Ibaraki 100k Ultra Marathon	9:24:22 h	53
23.02	204km	9th Little Edo Oedo 200k	26:12:33 h	20
2018
21.10	100km	7th Noto Peninsula 100 km Ultra Marathon	9:58:17 h	19
23.09	100km	28. Akita Nairiku 100km Marathon	9:44:45 h	45
24.06	100km	33. Lake Saroma 100 km Ultramarathon	9:39:43 h	333
03.06	78km	25. Ultramarathon Okumusashi	8:44:41 h	290
22.04	100km	28th Fuji 5 Lakes 100 km Challenge	11:25:53 h	292
03.03	204km	8th Little Edo Oedo 200k	27:43:18 h	30
21.01	100km	28th Miyako 100 km Ultramarathon	9:55:55 h	31
2017
15.10	100km	6th Noto Peninsula 100 km Ultra Marathon	10:20:33 h	31
24.09	100km	20th Muraoka 100 km Ultra Marathon	10:56:47 h	17
03.09	49.6km	6th Trainic world Ogose-Tokigawa Trail Run 50km	7:52:59 h	88
26.08	65km	20th Mt. Tateyama Climbathon	8:50:00 h	19
09.07	49.8km	5th Trainic world Chichibu Trail Run 50km	10:19:50 h	152
25.06	100km	32. Lake Saroma 100 km Ultramarathon	9:38:49 h	263
04.06	78km	24. Ultramarathon Okumusashi	8:11:46 h	240
21.05	100km	23rd Yatsugatake Nobeyama 100 km	13:59:09 h	1115
23.04	100km	27th Fuji 5 Lakes 100 km Challenge	9:49:17 h	129
04.03	113km	7th Oedo Night run 113k	13:17:29 h	7
15.01	100km	27th Miyako 100 km Ultramarathon	9:57:18 h	47
2016
11.12	71.7km	3rd Izu Trail Journey	12:27:58 h	659
09.10	100km	11th Echigo Kubikino 100km Ultramarathon	9:44:29 h	101
18.09	144km	19th Karisakatoge beyond Chichibu Run	22:30:03 h	52
11.09	100km	4th 100 km Ultramarathon Hakusan-Shirakawago	11:38:30 h	111
26.06	100km	31. Lake Saroma 100 km Ultramarathon	9:44:22 h	397
22.05	100km	22nd Yatsugatake Nobeyama 100 km	10:58:41 h	176
08.05	49.8km	4th Trainic world Chichibu Trail Run 50km	8:37:24 h	132
24.04	118km	26th Fuji 5 Lakes 118 km Challenge	11:58:28 h	83
05.03	204km	6th Little Edo Oedo 200k	28:43:43 h	26
17.01	100km	26th Miyako 100 km Ultramarathon	10:15:18 h	35
2015
06.09	49.6km	4th Trainic world Ogose-Tokigawa Trail Run 50km	8:17:43 h	143
19.07	65km	6th Nozawa Onsen 4100D Mountain Trail	13:25:35 h	223
28.06	100km	30. Lake Saroma 100 km Ultramarathon	9:59:26 h	529
22.06	77km	22. Ultramarathon Okumusashi	7:55:02 h	230
2014
27.07	77km	21. Ultramarathon Okumusashi	8:49:10 h	193

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	16/7/2022	6th Michinoku Tsugaru Journey Run 263K	266,00	×3
✓ 2	3/5/2026	21st River Road Foot Race 259km	259,00	×3
✓ 3	12/3/2022	12th Little Edo Oedo 230k	230,00	×2
✓ 4	23/2/2019	9th Little Edo Oedo 200k	204,00	×2
✓ 5	3/3/2018	8th Little Edo Oedo 200k	204,00	×2
✓ 6	5/3/2016	6th Little Edo Oedo 200k	204,00	×2
✓ 7	14/3/2026	16th Little Edo Oedo 200k	200,00	×2
✓ 8	11/3/2023	13th Little Edo Oedo 200k	200,00	×2
✓ 9	27/2/2021	11th Little Edo Oedo 200k	200,00	×2
✓ 10	15/6/2019	1st Nikko Sennin Concentric Journey Run	161,60	×1
✓ 11	8/6/2024	5th Nikko Sennin Concentric Highway Journey Run	159,00	×1
✓ 12	18/6/2022	3rd Nikko Sennin Concentric Highway Journey Run	159,00	×1
✓ 13	2/4/2022	2nd Tone River Run Up Journey Run Downstream	155,00	×1
✓ 14	9/10/2021	1st Tone River Run Up Journey Run Downstream	155,00	×1
✓ 15	13/7/2024	8th Michinoku Tsugaru Journey Run 154K	154,00	×1
✓ 16	28/2/2026	3rd Modern Japanese Silk Road Journey Run	150,00	×1
✓ 17	15/10/2022	1st Yagurazawa Round Trip Pre-Tournament	150,00	×1
✓ 18	30/10/2021	3rd Autumn leaves in Okumusashi / Chichibu Journey run	146,00	×1
✓ 19	24/10/2020	2nd Autumn leaves in Okumusashi / Chichibu Journey run	146,00	×1
✓ 20	2/11/2019	1st Autumn leaves in Okumusashi / Chichibu Journey run	145,00	×1
✓ 21	18/9/2016	19th Karisakatoge beyond Chichibu Run	144,00	×1
✓ 22	2/11/2024	6th Autumn leaves in Okumusashi / Chichibu Journey run	142,00	×1
✓ 23	1/11/2025	3rd Mito Kaido Journey run	130,00	×1
✓ 24	20/9/2020	3rd Utsukushima Fukushima Journey Run 127K	127,00	×1
✓ 25	14/9/2025	8th Utsukushima Fukushima Journey Run 122K	122,00	×1
✓ 26	14/9/2024	7th Utsukushima Fukushima Journey Run 122K	122,00	×1
✓ 27	16/10/2021	1st Tone River Run Up Journey Run Upstream	120,00	×1
✓ 28	21/4/2024	34th Fuji 5 Lakes 118 km Challenge	118,00	×1
✓ 29	24/4/2016	26th Fuji 5 Lakes 118 km Challenge	118,00	×1
✓ 30	17/7/2021	1st Nakasendo Ultra	117,00	×1
✓ 31	4/3/2017	7th Oedo Night run 113k	113,00	×1
✓ 32	20/4/2025	6th Yamadera Zao 111 km Ultra Marathon	111,00	×1
✓ 33	18/5/2024	9th Trainic World 100 km in Sai-No-Kuni	109,20	×1
✓ 34	21/5/2022	7th Trainic World 100 km in Sai-No-Kuni	109,20	×1
✓ 35	11/5/2019	4th Trainic World 100 km in Sai-No-Kuni	106,00	×1
✓ 36	17/5/2026	32th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 37	21/12/2025	8th Okinawa 100km Ultramarathon	100,00	×1
✓ 38	28/9/2025	33. Akita Nairiku 100km Marathon	100,00	×1
✓ 39	17/5/2025	10th Trainic World 100 km in Sai-No-Kuni	100,00	×1
✓ 40	12/4/2025	4th Yagurazawa Round Trip Pre-Tournament	100,00	×1
✓ 41	15/12/2024	7th Okinawa 100km Ultramarathon	100,00	×1
✓ 42	13/10/2024	15th Echigo Kubikino 100km Ultramarathon	100,00	×1
✓ 43	6/4/2024	3rd Yagurazawa Round Trip Pre-Tournament	100,00	×1
✓ 44	10/3/2024	6th Ibaraki 100k Ultra Marathon	100,00	×1
✓ 45	24/9/2023	31. Akita Nairiku 100km Marathon	100,00	×1
✓ 46	23/4/2023	4th Yamadera Zao 100 km Ultra Marathon	100,00	×1
✓ 47	15/4/2023	2nd Yagurazawa Round Trip Pre-Tournament	100,00	×1
✓ 48	9/10/2022	14th Echigo Kubikino 100km Ultramarathon	100,00	×1
✓ 49	25/9/2022	30. Akita Nairiku 100km Marathon	100,00	×1
✓ 50	24/4/2022	3rd Yamadera Zao 100 km Ultra Marathon	100,00	×1
✓ 51	7/10/2019	1st Fuji 4 Lakes 100 km Autumn Challenge	100,00	×1
✓ 52	22/9/2019	29. Akita Nairiku 100km Marathon	100,00	×1
✓ 53	30/6/2019	34. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 54	24/3/2019	1st Ibaraki 100k Ultra Marathon	100,00	×1
✓ 55	21/10/2018	7th Noto Peninsula 100 km Ultra Marathon	100,00	×1
✓ 56	23/9/2018	28. Akita Nairiku 100km Marathon	100,00	×1
✓ 57	24/6/2018	33. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 58	22/4/2018	28th Fuji 5 Lakes 100 km Challenge	100,00	×1
✓ 59	21/1/2018	28th Miyako 100 km Ultramarathon	100,00	×1
✓ 60	15/10/2017	6th Noto Peninsula 100 km Ultra Marathon	100,00	×1
✓ 61	24/9/2017	20th Muraoka 100 km Ultra Marathon	100,00	×1
✓ 62	25/6/2017	32. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 63	21/5/2017	23rd Yatsugatake Nobeyama 100 km	100,00	×1
✓ 64	23/4/2017	27th Fuji 5 Lakes 100 km Challenge	100,00	×1
✓ 65	15/1/2017	27th Miyako 100 km Ultramarathon	100,00	×1
✓ 66	9/10/2016	11th Echigo Kubikino 100km Ultramarathon	100,00	×1
✓ 67	11/9/2016	4th 100 km Ultramarathon Hakusan-Shirakawago	100,00	×1
✓ 68	26/6/2016	31. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 69	22/5/2016	22nd Yatsugatake Nobeyama 100 km	100,00	×1
✓ 70	17/1/2016	26th Miyako 100 km Ultramarathon	100,00	×1
✓ 71	28/6/2015	30. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 72	4/7/2021	27th 8-Hour Endurance Race Tokorozawa	83,30	×1
✓ 73	5/7/2020	26th 8-Hour Endurance Race Tokorozawa	83,30	×1
✓ 74	6/7/2025	12th Naeba-Sanroku Geopark Tsunan Ultramarathon 80K	80,00	—
✓ 75	29/6/2019	25th 8-Hour Endurance Race Tokorozawa	78,40	—
✓ 76	4/6/2023	30. Ultramarathon Okumusashi	78,00	—
✓ 77	5/6/2022	29. Ultramarathon Okumusashi	78,00	—
✓ 78	2/6/2019	26. Ultramarathon Okumusashi	78,00	—
79	3/6/2018	25. Ultramarathon Okumusashi	78,00	—
80	4/6/2017	24. Ultramarathon Okumusashi	78,00	—
81	22/6/2015	22. Ultramarathon Okumusashi	77,00	—
82	27/7/2014	21. Ultramarathon Okumusashi	77,00	—
83	1/7/2023	29th 8-Hour Endurance Race Tokorozawa	73,50	—
84	11/12/2016	3rd Izu Trail Journey	71,70	—
85	20/10/2024	31. Ultramarathon Okumusashi	70,00	—
86	10/4/2021	16th Toda Saiko 70 km	70,00	—
87	3/7/2022	28th 8-Hour Endurance Race Tokorozawa	68,60	—
88	26/8/2017	20th Mt. Tateyama Climbathon	65,00	—
89	19/7/2015	6th Nozawa Onsen 4100D Mountain Trail	65,00	—
90	22/8/2020	1st Toda Aya Lake Ultra Marathon	63,70	—
91	11/4/2026	21st Toda Saiko 60 km	60,00	—
92	4/4/2021	9th Arakawa Riverside Journey - 56 km	56,00	—
93	3/12/2023	11th Trainic world Ogose-Tokigawa Trail Run 50km	51,40	—
94	9/7/2017	5th Trainic world Chichibu Trail Run 50km	49,80	—
95	8/5/2016	4th Trainic world Chichibu Trail Run 50km	49,80	—
96	3/9/2017	6th Trainic world Ogose-Tokigawa Trail Run 50km	49,60	—
97	6/9/2015	4th Trainic world Ogose-Tokigawa Trail Run 50km	49,60	—