William Nguyen

Born : 1987 Cat. M35 Ultrarunner since 2009

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 ?

Australia

United States

42,3%

Rank quotient ?This runner's calculation uses 101 eligible race(s): Σ(rank − 1) = 5 947; Σ finishers = 14 072. 5 947 / 14 072 × 100 = 42.26%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed101

Km — ultra races7 693 km

> 100 km16

> 160 km16

Longest race160,9 km

47th Wasatch Front 100 Mile — 11/9/2026

Km per year (ultra races)

391

2022

633

2023

628

2024

762

2025

890

2026

Race types (share of distance)

Road2,7%

Trail97,3%

Wins & podiums (ultra)

🏆 Win0

🏆 Win M0

🏅 Top 33

🏅 Top 3 M6

Longest winning streak0

Current streak0

Records

50 km4h39'12 100 km13h25'08 50 mi8h45'42 100 mi22h44'50

HISTORY

101 race(s)

Date		Race	Perf.	Rk
2026
11.09	100mi	47th Wasatch Front 100 Mile	34:16:34 h	152
15.08	31.5mi	25th Tamalpa Headlands 50K	6:28:15 h	109
02.08	50km	45th Skyline 50k Endurance Run	6:40:04 h	92
18.06	46km	11th The Broken Arrow Skyrace	7:19:23 h	217
13.06	100mi	1st Bay Area 100	29:29:07 h	59
16.05	50mi	1st Rim Rock 50 Mile Trail Challenge	13:13:39 h	10
09.05	100km	43rd Quicksilver 100 km Endurance Run	15:32:28 h	126
14.03	50mi	14th Marin Ultra Challenge 50 Mile Race	11:40:54 h	93
17.01	100mi	26th HURT 100 Endurance Run 100 Mile	33:10:55 h	44
2025
29.11	28.4mi	40th Quad Dipsea Trail Run	6:57:50 h	162
11.10	50mi	39th Ruth Anderson Ultra 50mi	8:52:37 h	7
26.09	100mi	27th The Bear 100 Mile Endurance Run	28:15:27 h	70
16.08	31.5mi	24th Tamalpa Headlands 50K	5:31:55 h	80
14.06	100mi	15th Cool Moon 100 Mile Endurance Run	24:39:01 h	7
17.05	49km	12th Ultra-Trail Australia by UTMB - UTA50	9:47:33 h	1444
17.05	40mi	4th Napa Wilderness Trail Runs	8:38:52 h	5
10.05	100km	42nd Quicksilver 100 km Endurance Run	14:31:33 h	56
01.02	50km	47th Jed Smith Ultra Classic - 50 km Race	6:06:00 h	26
2024
30.11	28mi	39th Quad Dipsea Trail Run	6:42:32 h	157
12.10	50mi	38th Ruth Anderson Ultra 50mi	8:45:42 h	6
29.09	50mi	42nd Dick Collins Firetrails 50 Mile	10:45:12 h	23
17.08	31.5mi	23rd Tamalpa Headlands 50K	6:51:53 h	124
03.08	100mi	36th Angeles Crest 100 Mile	27:31:13 h	31
22.06	46km	9th The Broken Arrow Skyrace	7:40:16 h	171
18.05	40mi	3rd Napa Wilderness Trail Runs	8:27:05 h	4
11.05	100km	41th Quicksilver 100 km Endurance Run	15:16:48 h	64
2023
25.11	28mi	38th Quad Dipsea Trail Run	6:11:46 h	138
04.11	100mi	23rd Rio Del Lago 100 Mile Endurance Run	24:55:13 h	61
30.09	50mi	41st Dick Collins Firetrails 50 Mile	9:52:46 h	13
19.08	31.5mi	22nd Tamalpa Headlands 50K	6:23:06 h	92
06.08	50km	42nd Skyline 50k Endurance Run	5:33:08 h	19
29.07	50km	2nd Napa Wilderness Trail Runs	5:44:20 h	7
17.06	46km	8th The Broken Arrow Skyrace	6:36:43 h	153
13.05	100km	40th Quicksilver 100 km Endurance Run	14:41:50 h	34
15.04	50km	8th Woodside Purisima Creek Crossover	5:46:33 h	11
2022
10.12	50km	18th Rodeo Beach 50km	6:04:00 h	4
24.09	50mi	40th Dick Collins Firetrails 50 Mile	10:49:32 h	21
13.08	100mi	16th Headlands Hundred 100 Mile Endurance Run	25:52:00 h	6
07.08	50km	41st Skyline 50k Endurance Run	5:42:13 h	47
11.06	50km	1st Napa Wilderness Trail Runs	8:08:44 h	2 🥈
2021
23.10	100km	38th Quicksilver 100 km Endurance Run	14:07:06 h	61
25.09	50mi	39th Dick Collins Firetrails 50 Mile	11:49:22 h	34
19.08	100mi	15th Headlands Hundred 100 Mile Endurance Run	28:50:06 h	11
05.06	50km	6th Ruck a Chuck 50K	6:37:33 h	20
2020
22.02	52km	3rd Mount Umunhum Trail Run	6:37:54 h	36
2019
02.11	50km	17th Woodside Trail Run 50K	6:52:27 h	29
05.10	50km	11th Skyline to the Sea 50km	6:20:22 h	78
14.09	100mi	13th Headlands Hundred 100 Mile Endurance Run	28:17:09 h	22
25.08	50km	10th Diablo 50 km Trail Run	7:02:40 h	4
03.08	50km	1st The Groves 50km Trail Race	7:22:14 h	30
20.07	50km	16th Pacifica 50 km Trail Run	7:11:25 h	17
29.06	100mi	46th Western States 100 Mile Endurance Run	26:38:43 h	170
01.06	60km	3rd The Ridge 60k Race	7:35:24 h	19
18.05	50km	17th Mount Diablo 50k	9:11:50 h	15
11.05	100km	36th Quicksilver 100 km Endurance Run	13:54:46 h	42
04.05	50km	6th Armstrong Redwoods 50K Trail Run	7:07:41 h	20
20.04	50km	Saratoga Trail Run 50km	7:08:32 h	12
23.03	50km	3rd San Jose Trail Run	6:05:40 h	21
23.02	52km	2nd Mount Umunhum Trail Run	6:16:43 h	11
2018
03.11	50km	16th Woodside Trail Run 50K	5:19:32 h	9
20.10	50km	Saratoga Trail Run 50km	6:13:21 h	13
01.09	100mi	12th Headlands Hundred 100 Mile Endurance Run	22:44:50 h	4
26.08	50km	9th Diablo 50 km Trail Run	5:46:07 h	3 🥉
18.08	50km	2nd Mount Madonna Trail Run	6:04:30 h	3 🥉
04.08	60km	2nd The Ridge 60k Race	6:49:22 h	9
28.07	50km	15th Pacifica 50 km Trail Run	5:36:54 h	10
20.05	50km	31th Ohlone 50K Wilderness Run	5:57:42 h	18
12.05	100km	35th Quicksilver 100 km Endurance Run	13:25:08 h	37
24.02	52km	1st Mount Umunhum Trail Run	7:01:00 h	42
2017
18.11	50km	15th Woodside Trail Run 50K	6:13:59 h	22
23.09	50km	1st Mount Madonna Trail Run	7:22:00 h	8
09.09	100mi	11th Headlands Hundred 100 Mile Endurance Run	27:34:00 h	26
27.08	50km	8th Diablo 50 km Trail Run	7:16:12 h	6
12.08	60km	1st The Ridge 60k Race	7:23:32 h	32
08.07	50km	14th Pacifica 50 km Trail Run	5:42:04 h	4
03.06	50km	15th Mount Diablo 50k	7:42:07 h	9
21.05	50km	30th Ohlone 50K Wilderness Run	7:08:20 h	33
13.05	100km	34th Quicksilver 100 km Endurance Run	14:34:25 h	86
2016
10.09	100mi	10th Headlands Hundred 100 Mile Endurance Run	27:58:35 h	17
27.08	31.5mi	17th Tamalpa Headlands 50K	6:53:13 h	132
10.07	50km	13th Pacifica 50 km Trail Run	6:35:07 h	15
22.05	50km	29th Ohlone 50K Wilderness Run	6:38:43 h	31
2015
10.10	50mi	33rd Dick Collins Firetrails 50 Mile	10:06:00 h	57
26.09	50km	14th Stevens Creek Striders 50K	6:49:34 h	10
20.09	50km	28th Ohlone 50K Wilderness Run	6:54:26 h	20
12.07	50km	12th Pacifica 50 km Trail Run	6:08:58 h	16
2014
13.09	100mi	8th Headlands Hundred 100 Mile Endurance Run	29:40:15 h	23
23.08	31.5mi	15th Tamalpa Headlands 50K	6:27:15 h	82
02.08	50mi	2nd San Francisco 50 Mile Endurance Run	12:15:12 h	42
10.05	50km	14th Mount Diablo 50k	7:38:58 h	6
05.04	50mi	35th American River 50 Mile Endurance Run	9:48:11 h	242
2013
22.06	50mi	2nd Marin Ultra Challenge 50 Mile Race	10:04:12 h	28
02.06	50km	13th Mount Diablo 50k	7:03:42 h	6
2012
15.12	50km	8th Rodeo Beach 50km	7:33:23 h	35
13.10	50mi	5th Twin Peaks 50M	10:11:42 h	5
12.08	50km	31st Skyline 50k Endurance Run	4:39:12 h	15
2011
03.12	50mi	5th Endurance Challenge - California Trail 50 Mile	10:07:40 h	134
28.08	50km	7th Sequoia Trail Run	5:52:31 h	10
2010
18.09	50km	7th Redwood Park 50K Trail Run	6:50:26 h	39
2009
08.08	50km	5th Angeles National Forest 50k Trail Race	6:36:57 h	52
Unknown date
—	100mi	16th Pine to Palm 100 Mile Endurance Run	28:34:38 h	58

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	11/9/2026	47th Wasatch Front 100 Mile	160,93	×2
✓ 2	13/6/2026	1st Bay Area 100	160,93	×2
✓ 3	17/1/2026	26th HURT 100 Endurance Run 100 Mile	160,93	×2
✓ 4	26/9/2025	27th The Bear 100 Mile Endurance Run	160,93	×2
✓ 5	14/6/2025	15th Cool Moon 100 Mile Endurance Run	160,93	×2
✓ 6	3/8/2024	36th Angeles Crest 100 Mile	160,93	×2
✓ 7	4/11/2023	23rd Rio Del Lago 100 Mile Endurance Run	160,93	×2
✓ 8	13/8/2022	16th Headlands Hundred 100 Mile Endurance Run	160,93	×2
✓ 9	19/8/2021	15th Headlands Hundred 100 Mile Endurance Run	160,93	×2
✓ 10	14/9/2019	13th Headlands Hundred 100 Mile Endurance Run	160,93	×2
✓ 11	29/6/2019	46th Western States 100 Mile Endurance Run	160,93	×2
✓ 12	1/9/2018	12th Headlands Hundred 100 Mile Endurance Run	160,93	×2
✓ 13	9/9/2017	11th Headlands Hundred 100 Mile Endurance Run	160,93	×2
✓ 14	10/9/2016	10th Headlands Hundred 100 Mile Endurance Run	160,93	×2
✓ 15	13/9/2014	8th Headlands Hundred 100 Mile Endurance Run	160,93	×2
✓ 16	—	16th Pine to Palm 100 Mile Endurance Run	160,93	×2
✓ 17	9/5/2026	43rd Quicksilver 100 km Endurance Run	100,00	×1
✓ 18	10/5/2025	42nd Quicksilver 100 km Endurance Run	100,00	×1
✓ 19	11/5/2024	41th Quicksilver 100 km Endurance Run	100,00	×1
✓ 20	13/5/2023	40th Quicksilver 100 km Endurance Run	100,00	×1
✓ 21	23/10/2021	38th Quicksilver 100 km Endurance Run	100,00	×1
✓ 22	11/5/2019	36th Quicksilver 100 km Endurance Run	100,00	×1
✓ 23	12/5/2018	35th Quicksilver 100 km Endurance Run	100,00	×1
✓ 24	13/5/2017	34th Quicksilver 100 km Endurance Run	100,00	×1
✓ 25	16/5/2026	1st Rim Rock 50 Mile Trail Challenge	80,47	×1
✓ 26	14/3/2026	14th Marin Ultra Challenge 50 Mile Race	80,47	×1
✓ 27	11/10/2025	39th Ruth Anderson Ultra 50mi	80,47	×1
✓ 28	12/10/2024	38th Ruth Anderson Ultra 50mi	80,47	×1
✓ 29	29/9/2024	42nd Dick Collins Firetrails 50 Mile	80,47	×1
✓ 30	30/9/2023	41st Dick Collins Firetrails 50 Mile	80,47	×1
✓ 31	24/9/2022	40th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 32	25/9/2021	39th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 33	10/10/2015	33rd Dick Collins Firetrails 50 Mile	80,47	×1
✓ 34	2/8/2014	2nd San Francisco 50 Mile Endurance Run	80,47	×1
✓ 35	5/4/2014	35th American River 50 Mile Endurance Run	80,47	×1
✓ 36	22/6/2013	2nd Marin Ultra Challenge 50 Mile Race	80,47	×1
✓ 37	13/10/2012	5th Twin Peaks 50M	80,47	×1
✓ 38	3/12/2011	5th Endurance Challenge - California Trail 50 Mile	80,47	×1
✓ 39	17/5/2025	4th Napa Wilderness Trail Runs	64,37	×1
✓ 40	18/5/2024	3rd Napa Wilderness Trail Runs	64,37	×1
✓ 41	1/6/2019	3rd The Ridge 60k Race	60,00	×1
✓ 42	4/8/2018	2nd The Ridge 60k Race	60,00	×1
✓ 43	12/8/2017	1st The Ridge 60k Race	60,00	×1
✓ 44	22/2/2020	3rd Mount Umunhum Trail Run	52,00	—
✓ 45	23/2/2019	2nd Mount Umunhum Trail Run	52,00	—
✓ 46	24/2/2018	1st Mount Umunhum Trail Run	52,00	—
✓ 47	15/8/2026	25th Tamalpa Headlands 50K	50,69	—
✓ 48	16/8/2025	24th Tamalpa Headlands 50K	50,69	—
✓ 49	17/8/2024	23rd Tamalpa Headlands 50K	50,69	—
✓ 50	19/8/2023	22nd Tamalpa Headlands 50K	50,69	—
51	27/8/2016	17th Tamalpa Headlands 50K	50,69	—
52	23/8/2014	15th Tamalpa Headlands 50K	50,69	—
53	2/8/2026	45th Skyline 50k Endurance Run	50,00	—
54	1/2/2025	47th Jed Smith Ultra Classic - 50 km Race	50,00	—
55	6/8/2023	42nd Skyline 50k Endurance Run	50,00	—
56	29/7/2023	2nd Napa Wilderness Trail Runs	50,00	—
57	15/4/2023	8th Woodside Purisima Creek Crossover	50,00	—
58	10/12/2022	18th Rodeo Beach 50km	50,00	—
59	7/8/2022	41st Skyline 50k Endurance Run	50,00	—
60	11/6/2022	1st Napa Wilderness Trail Runs	50,00	—
61	5/6/2021	6th Ruck a Chuck 50K	50,00	—
62	2/11/2019	17th Woodside Trail Run 50K	50,00	—
63	5/10/2019	11th Skyline to the Sea 50km	50,00	—
64	25/8/2019	10th Diablo 50 km Trail Run	50,00	—
65	3/8/2019	1st The Groves 50km Trail Race	50,00	—
66	20/7/2019	16th Pacifica 50 km Trail Run	50,00	—
67	18/5/2019	17th Mount Diablo 50k	50,00	—
68	4/5/2019	6th Armstrong Redwoods 50K Trail Run	50,00	—
69	20/4/2019	Saratoga Trail Run 50km	50,00	—
70	23/3/2019	3rd San Jose Trail Run	50,00	—
71	3/11/2018	16th Woodside Trail Run 50K	50,00	—
72	20/10/2018	Saratoga Trail Run 50km	50,00	—
73	26/8/2018	9th Diablo 50 km Trail Run	50,00	—
74	18/8/2018	2nd Mount Madonna Trail Run	50,00	—
75	28/7/2018	15th Pacifica 50 km Trail Run	50,00	—
76	20/5/2018	31th Ohlone 50K Wilderness Run	50,00	—
77	18/11/2017	15th Woodside Trail Run 50K	50,00	—
78	23/9/2017	1st Mount Madonna Trail Run	50,00	—
79	27/8/2017	8th Diablo 50 km Trail Run	50,00	—
80	8/7/2017	14th Pacifica 50 km Trail Run	50,00	—
81	3/6/2017	15th Mount Diablo 50k	50,00	—
82	21/5/2017	30th Ohlone 50K Wilderness Run	50,00	—
83	10/7/2016	13th Pacifica 50 km Trail Run	50,00	—
84	22/5/2016	29th Ohlone 50K Wilderness Run	50,00	—
85	26/9/2015	14th Stevens Creek Striders 50K	50,00	—
86	20/9/2015	28th Ohlone 50K Wilderness Run	50,00	—
87	12/7/2015	12th Pacifica 50 km Trail Run	50,00	—
88	10/5/2014	14th Mount Diablo 50k	50,00	—
89	2/6/2013	13th Mount Diablo 50k	50,00	—
90	15/12/2012	8th Rodeo Beach 50km	50,00	—
91	12/8/2012	31st Skyline 50k Endurance Run	50,00	—
92	28/8/2011	7th Sequoia Trail Run	50,00	—
93	18/9/2010	7th Redwood Park 50K Trail Run	50,00	—
94	8/8/2009	5th Angeles National Forest 50k Trail Race	50,00	—
95	18/6/2026	11th The Broken Arrow Skyrace	46,00	—
96	22/6/2024	9th The Broken Arrow Skyrace	46,00	—
97	17/6/2023	8th The Broken Arrow Skyrace	46,00	—
98	29/11/2025	40th Quad Dipsea Trail Run	45,71	—
99	30/11/2024	39th Quad Dipsea Trail Run	45,06	—
100	25/11/2023	38th Quad Dipsea Trail Run	45,06	—