Yoko (山澤洋子) Yamazawa

Born : 1968 Cat. W55 Ultrarunner since 2003

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 ?

Belgium

Italy

Japan

South Korea

Netherlands

Taiwan

United States

14,3%

Rank quotient ?This runner's calculation uses 89 eligible race(s): Σ(rank − 1) = 7 678; Σ finishers = 53 583. 7 678 / 53 583 × 100 = 14.33%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed89

Km — ultra races7 661 km

> 100 km1

Longest race140,0 km

25. Yamaguchi 100 Hagi-O-Kan Maranic 140 km — 3/5/2013

Km per year (ultra races)

2022

200

2023

250

2024

200

2025

100

2026

Race types (share of distance)

Road98,7%

Trail1,3%

Wins & podiums (ultra)

🏆 Win0

🏆 Win F33

🏅 Top 31

🏅 Top 3 F52

Longest winning streak0

Current streak0

Records

50 km3h52'05 100 km8h01'59 6 h67,82 km

HISTORY

93 race(s) · 1 split(s) nested

Date		Race	Perf.	Rk
2026
28.06	100km	41. Lake Saroma 100 km Ultramarathon	12:09:01 h	1583
2025
29.06	100km	40. Lake Saroma 100 km Ultramarathon	11:54:19 h	967
26.01	100km	35th Miyako 100 km Ultramarathon	11:25:59 h	40
2024
13.10	50km	15th Echigo Kubikino 50km Ultramarathon	5:06:54 h	42
30.06	100km	39. Lake Saroma 100 km Ultramarathon	11:04:19 h	583
21.01	100km	34th Miyako 100 km Ultramarathon	11:26:56 h	68
2023
25.06	100km	38. Lake Saroma 100 km Ultramarathon	11:24:20 h	716
22.01	100km	33th Miyako 100 km Ultramarathon	11:42:16 h	51
2022
09.10	60km	14th Echigo Kubikino 60km Ultramarathon	6:06:36 h	47
2020
19.01	100km	30th Miyako 100 km Ultramarathon	10:38:58 h	64
2019
30.06	100km	34. Lake Saroma 100 km Ultramarathon	10:14:46 h	468
20.01	100km	29th Miyako 100 km Ultramarathon	10:45:01 h	43
2018
20.10	100km	3rd Iki 100 km Ultra Marathon	10:07:48 h	35
24.06	100km	33. Lake Saroma 100 km Ultramarathon	9:41:52 h	340
17.03	6h	8th Iikoto Challenge - 6h	67.820 km	5
21.01	100km	28th Miyako 100 km Ultramarathon	10:04:38 h	34
2017
25.06	100km	32. Lake Saroma 100 km Ultramarathon	10:27:59 h	490
15.01	100km	27th Miyako 100 km Ultramarathon	9:44:50 h	35
2016
09.10	60km	11th Echigo Kubikino 60km Ultramarathon	5:23:10 h	20
26.06	100km	31. Lake Saroma 100 km Ultramarathon	9:28:26 h	280
06.03	100km	2nd Nagoura Marathon 100 km	10:57:13 h	22
17.01	100km	26th Miyako 100 km Ultramarathon	9:16:17 h	11
2015
27.09	100km	25. Akita Nairiku 100km Marathon	9:32:35 h	54
28.06	100km	30. Lake Saroma 100 km Ultramarathon	8:56:41 h	173
14.06	50km	11th Iwate Ginga 50km Marathon Challenge	4:22:40 h	30
06.06	50km	25th Aso Caldera Super Marathon 50 km	4:13:29 h	16
17.05	60km	1st Ishigaki Island Ultra Marathon	6:02:30 h	11
11.01	100km	25th Miyako 100 km Ultramarathon	8:29:08 h	9
2014
12.10	60km	10th Echigo Kubikino 60km Ultramarathon	4:59:22 h	11
29.06	100km	29. Lake Saroma 100 km Ultramarathon	9:01:45 h	86
27.04	100km	16. Okukumano 100 km Ultramarathon	9:09:26 h	13
12.01	100km	24th Miyako 100 km Ultramarathon	8:42:34 h	8
2013
20.10	100km	2nd Noto Peninsula 100 km Ultra Marathon	9:02:44 h	11
22.09	50km	23. Akita Nairiku 50km Marathon	4:01:15 h	13
11.08	50km	3rd North Okhotsk 50 km Marathon	4:09:18 h	10
30.06	100km road race	28. Lake Saroma 100 km Ultramarathon	8:51:40 h	97
03.05	140km	25. Yamaguchi 100 Hagi-O-Kan Maranic 140 km	17:42:12 h	10
28.04	100km	15. Okukumano 100 km Ultramarathon	9:08:39 h	7
03.03	50km	8h Saipan Marathon	4:28:24 h	5
13.01	100km	23rd Miyako 100 km Ultramarathon	8:44:24 h	6
2012
21.10	100km	1st Noto Peninsula 100 km Ultra Marathon	9:11:31 h	9
06.10	50km	9th Echigo Kubikino 50km Ultramarathon	4:03:00 h	17
23.09	50km	22. Akita Nairiku 50km Marathon	3:54:20 h	10
19.08	50km	2nd North Okhotsk 50 km Marathon	4:00:11 h	7
24.06	100km road race	27. Lake Saroma 100 km Ultramarathon	8:28:19 h	66
03.06	55km	12th Rishiri Island Ultra Marathon	4:19:00 h	4
22.04	100km	14. Okukumano 100 km Ultramarathon	9:10:08 h	8
14.01	100km	22nd Miyako 100 km Ultramarathon	8:52:14 h	6
2011
25.09	50km	21. Akita Nairiku 50km Marathon	3:52:05 h	8
21.08	55km	1st North Okhotsk 55 km Marathon	4:32:54 h	3 🥉
26.06	100km road race	26. Lake Saroma 100 km Ultramarathon	8:22:25 h	52
05.06	55km	11th Rishiri Island Ultra Marathon	4:18:43 h	4
24.04	60km	13. Okukumano 60 km Ultramarathon	5:00:17 h	4
16.01	100km	21st Miyako 100 km Ultramarathon	8:42:06 h	5
2010
09.10	50km	8th Echigo Kubikino 50km Ultramarathon	3:52:55 h	7
29.08	52km	58. Tsurunuma 52 km	4:54:00 h	13
27.06	100km	25. Lake Saroma 100 km Ultramarathon	8:51:02 h	72
25.04	72km	20th Fuji 5 Lakes 72 km Challenge	6:58:12 h	25
10.04	70km	5th Toda Saiko 70 km	6:10:35 h	21
27.03	100km	1st IAU 100km Asian Championship	8:53:11 h	8
17.01	100km	20th Miyako 100 km Ultramarathon	8:38:18 h	6
2009
02.08	75km	16. Ultramarathon Okumusashi	7:07:41 h	86
19.06	50mi	IAU 100km WC Torhout (30. Nacht van West-Vlaanderen) - 50mi split	6:33:18 h	64
19.06	100km	IAU 100km WC Torhout (30. Nacht van West-Vlaanderen)	8:10:05 h	57
06.06	50km	19th Aso Caldera Super Marathon 50 km	3:58:06 h	25
26.04	72km	19th Fuji 5 Lakes 72 km Challenge	5:54:02 h	13
11.04	70km	4th Toda Saiko 70 km	6:03:04 h	11
11.01	100km	19th Miyako 100 km Ultramarathon	8:27:07 h	6
2008
08.11	100km	IAU 100 km WC Tuscania (100 km degli Etruschi)	8:02:46 h	58
31.08	52km	54. Tsurunuma 52 km	4:13:13 h	6
13.01	100km	18th Miyako 100 km Ultramarathon	8:42:32 h	5
2007
08.09	100km	IAU 100km WC (RUN Winschoten 100 km)	8:04:35 h	65
08.09	50km	32. RUN Winschoten 100 km - 50km Split	3:58:47 h	107
08.09	100km	32. RUN Winschoten 100 km	8:04:35 h	79
05.08	75km	14. Ultramarathon Okumusashi	6:47:06 h	39
24.06	100km	22. Lake Saroma 100 km Ultramarathon	8:01:59 h	27
14.01	100km	17th Miyako 100 km Ultramarathon	8:38:41 h	6
2006
08.10	50km	IAU 100km WC Misari/Seoul - 50km Split	3:51:07 h	63
08.10	100km	IAU 100km WC Misari/Seoul	8:07:50 h	59
13.08	75km	13. Ultramarathon Okumusashi	6:37:19 h	22
25.06	100km	21. Lake Saroma 100 km Ultramarathon	8:08:39 h	21
15.01	100km	16th Miyako 100 km Ultramarathon	8:37:48 h	6
2005
07.08	75km	12. Ultramarathon Okumusashi	7:12:52 h	36
26.06	100km	IAU 100km WC Yubetsu (20. Lake Saroma 100 km Ultramarathon)	8:10:27 h	43
26.06	50km	IAU 100km WC Yubetsu (20. Lake Saroma 100 km Ultramarathon) - 50 km Split	3:49:42 h	57
16.01	100km	15th Miyako 100 km Ultramarathon	8:49:10 h	6
2004
17.10	100km	10th River Shimanto 100km	8:31:56 h	30
11.09	100km	29. IAU 100km WC Winschoten	8:03:37 h	59
11.09	50mi	29. IAU 100km WC Winschoten - 50mi split	7:13:09 h	60
27.06	100km	19. Lake Saroma 100 km Ultramarathon	8:22:02 h	50
16.05	100km	10th Yatsugatake Nobeyama 100 km	9:35:16 h	8
11.01	100km	14th Miyako 100 km Ultramarathon	8:44:19 h	5
2003
16.11	100km	IAU 100km WC Taipei	9:02:34 h	49
29.06	100km	18. Lake Saroma 100 km Ultramarathon	8:37:54 h	21

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	3/5/2013	25. Yamaguchi 100 Hagi-O-Kan Maranic 140 km	140,00	×2
✓ 2	28/6/2026	41. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 3	29/6/2025	40. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 4	26/1/2025	35th Miyako 100 km Ultramarathon	100,00	×1
✓ 5	30/6/2024	39. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 6	21/1/2024	34th Miyako 100 km Ultramarathon	100,00	×1
✓ 7	25/6/2023	38. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 8	22/1/2023	33th Miyako 100 km Ultramarathon	100,00	×1
✓ 9	19/1/2020	30th Miyako 100 km Ultramarathon	100,00	×1
✓ 10	30/6/2019	34. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 11	20/1/2019	29th Miyako 100 km Ultramarathon	100,00	×1
✓ 12	20/10/2018	3rd Iki 100 km Ultra Marathon	100,00	×1
✓ 13	24/6/2018	33. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 14	21/1/2018	28th Miyako 100 km Ultramarathon	100,00	×1
✓ 15	25/6/2017	32. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 16	15/1/2017	27th Miyako 100 km Ultramarathon	100,00	×1
✓ 17	26/6/2016	31. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 18	6/3/2016	2nd Nagoura Marathon 100 km	100,00	×1
✓ 19	17/1/2016	26th Miyako 100 km Ultramarathon	100,00	×1
✓ 20	27/9/2015	25. Akita Nairiku 100km Marathon	100,00	×1
✓ 21	28/6/2015	30. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 22	11/1/2015	25th Miyako 100 km Ultramarathon	100,00	×1
✓ 23	29/6/2014	29. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 24	27/4/2014	16. Okukumano 100 km Ultramarathon	100,00	×1
✓ 25	12/1/2014	24th Miyako 100 km Ultramarathon	100,00	×1
✓ 26	20/10/2013	2nd Noto Peninsula 100 km Ultra Marathon	100,00	×1
✓ 27	30/6/2013	28. Lake Saroma 100 km Ultramarathon (JPN)	100,00	×1
✓ 28	28/4/2013	15. Okukumano 100 km Ultramarathon	100,00	×1
✓ 29	13/1/2013	23rd Miyako 100 km Ultramarathon	100,00	×1
✓ 30	21/10/2012	1st Noto Peninsula 100 km Ultra Marathon	100,00	×1
✓ 31	24/6/2012	27. Lake Saroma 100 km Ultramarathon (JPN)	100,00	×1
✓ 32	22/4/2012	14. Okukumano 100 km Ultramarathon	100,00	×1
✓ 33	14/1/2012	22nd Miyako 100 km Ultramarathon	100,00	×1
✓ 34	26/6/2011	26. Lake Saroma 100 km Ultramarathon (JPN)	100,00	×1
✓ 35	16/1/2011	21st Miyako 100 km Ultramarathon	100,00	×1
✓ 36	27/6/2010	25. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 37	27/3/2010	1st IAU 100km Asian Championship	100,00	×1
✓ 38	17/1/2010	20th Miyako 100 km Ultramarathon	100,00	×1
✓ 39	19/6/2009	IAU 100km WC Torhout (30. Nacht van West-Vlaanderen)	100,00	×1
✓ 40	11/1/2009	19th Miyako 100 km Ultramarathon	100,00	×1
✓ 41	8/11/2008	IAU 100 km WC Tuscania (100 km degli Etruschi)	100,00	×1
✓ 42	13/1/2008	18th Miyako 100 km Ultramarathon	100,00	×1
✓ 43	8/9/2007	IAU 100km WC (RUN Winschoten 100 km)	100,00	×1
✓ 44	24/6/2007	22. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 45	14/1/2007	17th Miyako 100 km Ultramarathon	100,00	×1
✓ 46	8/10/2006	IAU 100km WC Misari/Seoul	100,00	×1
✓ 47	25/6/2006	21. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 48	15/1/2006	16th Miyako 100 km Ultramarathon	100,00	×1
✓ 49	26/6/2005	IAU 100km WC Yubetsu (20. Lake Saroma 100 km Ultramarathon)	100,00	×1
✓ 50	16/1/2005	15th Miyako 100 km Ultramarathon	100,00	×1
✓ 51	17/10/2004	10th River Shimanto 100km	100,00	×1
✓ 52	11/9/2004	29. IAU 100km WC Winschoten	100,00	×1
✓ 53	27/6/2004	19. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 54	16/5/2004	10th Yatsugatake Nobeyama 100 km	100,00	×1
✓ 55	11/1/2004	14th Miyako 100 km Ultramarathon	100,00	×1
✓ 56	16/11/2003	IAU 100km WC Taipei	100,00	×1
✓ 57	29/6/2003	18. Lake Saroma 100 km Ultramarathon	100,00	×1
✓ 58	2/8/2009	16. Ultramarathon Okumusashi	75,00	×1
✓ 59	5/8/2007	14. Ultramarathon Okumusashi	75,00	×1
✓ 60	13/8/2006	13. Ultramarathon Okumusashi	75,00	×1
✓ 61	7/8/2005	12. Ultramarathon Okumusashi	75,00	×1
✓ 62	25/4/2010	20th Fuji 5 Lakes 72 km Challenge	72,00	×1
✓ 63	26/4/2009	19th Fuji 5 Lakes 72 km Challenge	72,00	×1
✓ 64	10/4/2010	5th Toda Saiko 70 km	70,00	×1
✓ 65	11/4/2009	4th Toda Saiko 70 km	70,00	×1
✓ 66	17/3/2018	8th Iikoto Challenge - 6h	67,82	×1
67	9/10/2022	14th Echigo Kubikino 60km Ultramarathon	60,00	—
68	9/10/2016	11th Echigo Kubikino 60km Ultramarathon	60,00	—
69	17/5/2015	1st Ishigaki Island Ultra Marathon	60,00	—
70	12/10/2014	10th Echigo Kubikino 60km Ultramarathon	60,00	—
71	24/4/2011	13. Okukumano 60 km Ultramarathon	60,00	—
72	3/6/2012	12th Rishiri Island Ultra Marathon	55,00	—
73	21/8/2011	1st North Okhotsk 55 km Marathon	55,00	—
74	5/6/2011	11th Rishiri Island Ultra Marathon	55,00	—
75	29/8/2010	58. Tsurunuma 52 km	52,00	—
76	31/8/2008	54. Tsurunuma 52 km	52,00	—
77	13/10/2024	15th Echigo Kubikino 50km Ultramarathon	50,00	—
78	14/6/2015	11th Iwate Ginga 50km Marathon Challenge	50,00	—
79	6/6/2015	25th Aso Caldera Super Marathon 50 km	50,00	—
80	22/9/2013	23. Akita Nairiku 50km Marathon	50,00	—
81	11/8/2013	3rd North Okhotsk 50 km Marathon	50,00	—
82	3/3/2013	8h Saipan Marathon	50,00	—
83	6/10/2012	9th Echigo Kubikino 50km Ultramarathon	50,00	—
84	23/9/2012	22. Akita Nairiku 50km Marathon	50,00	—
85	19/8/2012	2nd North Okhotsk 50 km Marathon	50,00	—
86	25/9/2011	21. Akita Nairiku 50km Marathon	50,00	—
87	9/10/2010	8th Echigo Kubikino 50km Ultramarathon	50,00	—
88	6/6/2009	19th Aso Caldera Super Marathon 50 km	50,00	—