Alan Singleton

Born : 1965 Cat. M60 Ultrarunner since 2007

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 ?

United States

56,1%

Rank quotient ?This runner's calculation uses 100 eligible race(s): Σ(rank − 1) = 5 035; Σ finishers = 8 981. 5 035 / 8 981 × 100 = 56.06%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed100

Km — ultra races8 232 km

> 100 km16

> 160 km15

Longest race160,9 km

22th San Diego 100 Mile Endurance Run — 2/6/2023

Km per year (ultra races)

348

2022

441

2023

130

2024

230

2025

2026

Race types (share of distance)

Road0,6%

Trail99,4%

Wins & podiums (ultra)

🏆 Win0

🏆 Win M1

🏅 Top 33

🏅 Top 3 M6

Longest winning streak0

Current streak0

Records

50 km5h37'04 100 km15h01'55 50 mi9h55'45 100 mi25h59'00

HISTORY

100 race(s)

Date		Race	Perf.	Rk
2025
06.12	50km	11th Ray Miller 50 km Trail Race	7:47:57 h	96
27.09	50km	20th Angeles National Forest 50k Trail Race	8:16:50 h	26
16.08	50km	34th Bulldog 50k Ultra Run	7:00:17 h	115
12.04	50mi	32nd Leona Divide 50 Mile Run	15:03:37 h	62
2024
28.09	50km	7th Rocky Peak Trail Races	8:17:22 h	34
27.01	50mi	11th Sean O'Brien 50 Mile Trail Race	14:14:39 h	41
2023
14.10	50km	9th No Name 5030 - 50 km Run	6:49:47 h	49
19.08	50km	32th Bulldog 50k Ultra Run	6:33:37 h	79
29.07	50km	12th Harding Hustle 50K	7:25:42 h	38
01.07	50km	14th Orange Curtain 50km Ultra Race	6:09:57 h	13
02.06	100mi	22th San Diego 100 Mile Endurance Run	31:40:22 h	109
23.04	50mi	30th Leona Divide 50 Mile Run	13:59:25 h	54
2022
20.08	50km	31th Bulldog 50k Ultra Run	6:54:34 h	63
03.06	100mi	21th San Diego 100 Mile Endurance Run	31:01:27 h	102
23.04	50mi	29th Leona Divide 50 Mile Run	11:20:26 h	33
19.03	35mi	24th Santa Barbara Nine Trails 35 Mile Endurance Run	10:47:18 h	72
2021
06.11	50km	28th Leona Divide 50 km Run	6:36:59 h	8
02.10	50km	30th Bulldog 50k Ultra Run	6:35:44 h	50
2020
08.02	50mi	7th Sean O'Brien 50 Mile Trail Race	14:20:02 h	138
2019
07.12	50mi	6th Ray Miller 50 Mile Trail Race	13:34:45 h	90
16.11	50mi	13th Old Goat's 50 Mile Trail Race	17:38:00 h	2 🥈
19.10	50km	3rd Rocky Peak Trail Races	6:37:19 h	21
24.08	50km	28th Bulldog 50k Ultra Run	7:23:38 h	84
16.08	100mi	9th Kodiak 100 Mile Ultramarathon	35:22:29 h	69
06.07	60km	14th Angeles National Forest 60k Trail Race	10:23:42 h	46
06.04	50mi	27th Leona Divide 50 Mile Run	13:27:44 h	84
2018
17.11	100km	10th The Chimera 100 km Mountain Race	19:45:18 h	5
20.10	50km	2nd Rocky Peak Trail Races	7:13:30 h	32
25.08	50km	27th Bulldog 50k Ultra Run	6:40:16 h	87
08.06	100mi	17th San Diego 100 Mile Endurance Run	31:32:01 h	144
14.04	50mi	26th Leona Divide 50 Mile Run	11:46:05 h	79
31.03	50mi	12th Old Goat's 50 Mile Trail Race	13:32:48 h	32
03.02	50mi	5th Sean O'Brien 50 Mile Trail Race	13:27:40 h	75
2017
18.11	100mi	9th The Chimera 100 Mile Mountain Race	34:04:15 h	38
26.08	50km	26th Bulldog 50k Ultra Run	7:03:57 h	66
14.07	100km	7th Santa Barbara 100 km Endurance Race	23:04:39 h	34
09.06	100mi	16th San Diego 100 Mile Endurance Run	30:33:14 h	136
22.04	50mi	25th Leona Divide 50 Mile Run	12:12:25 h	68
01.04	50mi	11th Old Goat's 50 Mile Trail Race	12:14:02 h	39
11.03	68mi	3rd Coyote Cohorts Backbone 68 Mile Trail Ultra	20:37:58 h	54
04.02	100km	4th Sean O'Brien 100 km Trail Race	15:01:55 h	120
2016
12.11	100mi	8th The Chimera 100 Mile Mountain Race	33:22:45 h	29
27.08	50km	25th Bulldog 50k Ultra Run	5:46:58 h	67
16.04	50mi	24th Leona Divide 50 Mile Run	11:49:51 h	98
26.03	50mi	10th Old Goat's 50 Mile Trail Race	12:35:58 h	25
06.02	100km	3rd Sean O'Brien 100 km Trail Race	16:28:48 h	72
30.01	50km	6th Bandit Ultra 50K Trail Run	6:35:37 h	35
2015
12.12	50km	6th Malibu Canyon 50 km Trail Run	6:12:29 h	26
14.11	100mi	7th The Chimera 100 Mile Mountain Race	31:31:48 h	36
17.10	52.5mi	7th Twin Peaks 50M	13:45:00 h	12
22.08	50km	24th Bulldog 50k Ultra Run	6:11:17 h	98
10.07	100mi	5th Santa Barbara 100 Mile Endurance Race	34:42:08 h	19
25.04	50mi	23rd Leona Divide 50 Mile Run	10:30:01 h	36
21.03	50mi	9th Old Goat's 50 Mile Trail Race	11:45:08 h	21
15.02	50km	5th Bandit Ultra 50K Trail Run	6:36:47 h	46
2014
15.11	100mi	6th The Chimera 100 Mile Mountain Race	30:50:24 h	56
18.10	50mi	6th Twin Peaks 50M	13:21:40 h	17
26.04	50mi	22nd Leona Divide 50 Mile Run	10:23:33 h	77
22.03	50mi	8th Old Goat's 50 Mile Trail Race	12:13:08 h	52
16.02	50km	4th Bandit Ultra 50K Trail Run	6:26:04 h	50
01.02	50mi	1st Sean O'Brien 50 Mile Trail Race	11:36:29 h	113
2013
16.11	100mi	5th The Chimera 100 Mile Mountain Race	31:07:05 h	63
24.08	50km	22nd Bulldog 50k Ultra Run	6:20:30 h	87
29.06	50km	3rd Harding Hustle 50K	7:23:02 h	23
27.04	50mi	21st Leona Divide 50 Mile Run	11:21:01 h	133
23.03	50mi	7th Old Goat's 50 Mile Trail Race	11:57:43 h	62
02.02	50mi	2nd Ray Miller 50 Mile Trail Race	11:33:30 h	59
2012
17.11	100mi	4th The Chimera 100 Mile Mountain Race	29:28:09 h	47
13.10	50mi	5th Twin Peaks 50M	15:20:42 h	44
25.08	50km	21st Bulldog 50k Ultra Run	6:11:49 h	92
11.08	50km	8th Angeles National Forest 50k Trail Race	8:22:04 h	45
28.04	50mi	20th Leona Divide 50 Mile Run	10:26:49 h	92
24.03	50mi	6th Old Goat's 50 Mile Trail Race	11:22:33 h	49
26.02	50km	2nd La Jolla Canyon 50 km Trail Run	5:54:23 h	3 🥉
2011
19.11	100mi	3rd The Chimera 100 Mile Mountain Race	29:06:20 h	19
23.10	50km	2nd Malibu Canyon 50 km Trail Run	6:17:57 h	6
09.10	50mi	4th Twin Peaks 50M	14:04:00 h	27
23.07	100mi	24th Angeles Crest 100 Mile	31:17:52 h	49
26.03	50mi	5th Old Goat's 50 Mile Trail Race	12:09:49 h	68
06.03	50km	4th Malibu Creek Trail Run	5:57:56 h	14
2010
20.11	50km	1st Los Pinos 50K	8:07:22 h	25
24.10	50km	1st Malibu Canyon 50 km Trail Run	5:37:04 h	4
18.09	100mi	2nd The Chimera 100 Mile Mountain Race	25:59:00 h	2 🥈
21.08	50km	19th Bulldog 50k Ultra Run	5:54:24 h	61
05.06	100km	2nd Blue Canyon 100 km Trail Race	17:12:00 h	4
17.04	50mi	18th Leona Divide 50 Mile Run	9:55:45 h	54
27.03	50mi	4th Old Goat's 50 Mile Trail Race	11:39:00 h	49
07.03	50km	3rd Malibu Creek Trail Run	6:36:34 h	33
13.02	50mi	3rd Twin Peaks 50M	14:44:37 h	28
2009
22.11	50km	5th Santa Monica Mountains 50 km	6:18:32 h	25
08.08	50mi	5th Angeles National Forest 50Mile Trail Race	11:19:20 h	34
06.06	100km	1st Blue Canyon 100 km Trail Race	17:21:45 h	8
18.04	50mi	17th Leona Divide 50 Mile Run	10:47:58 h	64
28.03	50mi	3rd Old Goat's 50 Mile Trail Race	11:30:07 h	29
08.03	50km	2nd Malibu Creek Trail Run	6:29:02 h	37
2008
23.11	50km	4th Santa Monica Mountains 50 km	6:32:26 h	30
09.08	50mi	4th Angeles National Forest 50Mile Trail Race	12:55:16 h	58
18.05	50km	1st Sycamore Canyon 50K	7:36:20 h	14
12.04	50mi	2nd Old Goat's 50 Mile Trail Race	11:56:04 h	14
2007
10.11	50mi	1st Old Goat's 50 Mile Trail Race	9:56:36 h	8

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	2/6/2023	22th San Diego 100 Mile Endurance Run	160,93	×2
✓ 2	3/6/2022	21th San Diego 100 Mile Endurance Run	160,93	×2
✓ 3	16/8/2019	9th Kodiak 100 Mile Ultramarathon	160,93	×2
✓ 4	8/6/2018	17th San Diego 100 Mile Endurance Run	160,93	×2
✓ 5	18/11/2017	9th The Chimera 100 Mile Mountain Race	160,93	×2
✓ 6	9/6/2017	16th San Diego 100 Mile Endurance Run	160,93	×2
✓ 7	12/11/2016	8th The Chimera 100 Mile Mountain Race	160,93	×2
✓ 8	14/11/2015	7th The Chimera 100 Mile Mountain Race	160,93	×2
✓ 9	10/7/2015	5th Santa Barbara 100 Mile Endurance Race	160,93	×2
✓ 10	15/11/2014	6th The Chimera 100 Mile Mountain Race	160,93	×2
✓ 11	16/11/2013	5th The Chimera 100 Mile Mountain Race	160,93	×2
✓ 12	17/11/2012	4th The Chimera 100 Mile Mountain Race	160,93	×2
✓ 13	19/11/2011	3rd The Chimera 100 Mile Mountain Race	160,93	×2
✓ 14	23/7/2011	24th Angeles Crest 100 Mile	160,93	×2
✓ 15	18/9/2010	2nd The Chimera 100 Mile Mountain Race	160,93	×2
✓ 16	11/3/2017	3rd Coyote Cohorts Backbone 68 Mile Trail Ultra	109,44	×1
✓ 17	17/11/2018	10th The Chimera 100 km Mountain Race	100,00	×1
✓ 18	14/7/2017	7th Santa Barbara 100 km Endurance Race	100,00	×1
✓ 19	4/2/2017	4th Sean O'Brien 100 km Trail Race	100,00	×1
✓ 20	6/2/2016	3rd Sean O'Brien 100 km Trail Race	100,00	×1
✓ 21	5/6/2010	2nd Blue Canyon 100 km Trail Race	100,00	×1
✓ 22	6/6/2009	1st Blue Canyon 100 km Trail Race	100,00	×1
✓ 23	17/10/2015	7th Twin Peaks 50M	84,49	×1
✓ 24	12/4/2025	32nd Leona Divide 50 Mile Run	80,47	×1
✓ 25	27/1/2024	11th Sean O'Brien 50 Mile Trail Race	80,47	×1
✓ 26	23/4/2023	30th Leona Divide 50 Mile Run	80,47	×1
✓ 27	23/4/2022	29th Leona Divide 50 Mile Run	80,47	×1
✓ 28	8/2/2020	7th Sean O'Brien 50 Mile Trail Race	80,47	×1
✓ 29	7/12/2019	6th Ray Miller 50 Mile Trail Race	80,47	×1
✓ 30	16/11/2019	13th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 31	6/4/2019	27th Leona Divide 50 Mile Run	80,47	×1
✓ 32	14/4/2018	26th Leona Divide 50 Mile Run	80,47	×1
✓ 33	31/3/2018	12th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 34	3/2/2018	5th Sean O'Brien 50 Mile Trail Race	80,47	×1
✓ 35	22/4/2017	25th Leona Divide 50 Mile Run	80,47	×1
✓ 36	1/4/2017	11th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 37	16/4/2016	24th Leona Divide 50 Mile Run	80,47	×1
✓ 38	26/3/2016	10th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 39	25/4/2015	23rd Leona Divide 50 Mile Run	80,47	×1
✓ 40	21/3/2015	9th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 41	18/10/2014	6th Twin Peaks 50M	80,47	×1
✓ 42	26/4/2014	22nd Leona Divide 50 Mile Run	80,47	×1
✓ 43	22/3/2014	8th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 44	1/2/2014	1st Sean O'Brien 50 Mile Trail Race	80,47	×1
✓ 45	27/4/2013	21st Leona Divide 50 Mile Run	80,47	×1
✓ 46	23/3/2013	7th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 47	2/2/2013	2nd Ray Miller 50 Mile Trail Race	80,47	×1
✓ 48	13/10/2012	5th Twin Peaks 50M	80,47	×1
✓ 49	28/4/2012	20th Leona Divide 50 Mile Run	80,47	×1
✓ 50	24/3/2012	6th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 51	9/10/2011	4th Twin Peaks 50M	80,47	×1
✓ 52	26/3/2011	5th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 53	17/4/2010	18th Leona Divide 50 Mile Run	80,47	×1
✓ 54	27/3/2010	4th Old Goat's 50 Mile Trail Race	80,47	×1
✓ 55	13/2/2010	3rd Twin Peaks 50M	80,47	×1
✓ 56	8/8/2009	5th Angeles National Forest 50Mile Trail Race	80,47	×1
✓ 57	18/4/2009	17th Leona Divide 50 Mile Run	80,47	×1
✓ 58	28/3/2009	3rd Old Goat's 50 Mile Trail Race	80,47	×1
✓ 59	9/8/2008	4th Angeles National Forest 50Mile Trail Race	80,47	×1
✓ 60	12/4/2008	2nd Old Goat's 50 Mile Trail Race	80,47	×1
✓ 61	10/11/2007	1st Old Goat's 50 Mile Trail Race	80,47	×1
62	6/7/2019	14th Angeles National Forest 60k Trail Race	60,00	—
63	19/3/2022	24th Santa Barbara Nine Trails 35 Mile Endurance Run	56,33	—
64	6/12/2025	11th Ray Miller 50 km Trail Race	50,00	—
65	27/9/2025	20th Angeles National Forest 50k Trail Race	50,00	—
66	16/8/2025	34th Bulldog 50k Ultra Run	50,00	—
67	28/9/2024	7th Rocky Peak Trail Races	50,00	—
68	14/10/2023	9th No Name 5030 - 50 km Run	50,00	—
69	19/8/2023	32th Bulldog 50k Ultra Run	50,00	—
70	29/7/2023	12th Harding Hustle 50K	50,00	—
71	1/7/2023	14th Orange Curtain 50km Ultra Race	50,00	—
72	20/8/2022	31th Bulldog 50k Ultra Run	50,00	—
73	6/11/2021	28th Leona Divide 50 km Run	50,00	—
74	2/10/2021	30th Bulldog 50k Ultra Run	50,00	—
75	19/10/2019	3rd Rocky Peak Trail Races	50,00	—
76	24/8/2019	28th Bulldog 50k Ultra Run	50,00	—
77	20/10/2018	2nd Rocky Peak Trail Races	50,00	—
78	25/8/2018	27th Bulldog 50k Ultra Run	50,00	—
79	26/8/2017	26th Bulldog 50k Ultra Run	50,00	—
80	27/8/2016	25th Bulldog 50k Ultra Run	50,00	—
81	30/1/2016	6th Bandit Ultra 50K Trail Run	50,00	—
82	12/12/2015	6th Malibu Canyon 50 km Trail Run	50,00	—
83	22/8/2015	24th Bulldog 50k Ultra Run	50,00	—
84	15/2/2015	5th Bandit Ultra 50K Trail Run	50,00	—
85	16/2/2014	4th Bandit Ultra 50K Trail Run	50,00	—
86	24/8/2013	22nd Bulldog 50k Ultra Run	50,00	—
87	29/6/2013	3rd Harding Hustle 50K	50,00	—
88	25/8/2012	21st Bulldog 50k Ultra Run	50,00	—
89	11/8/2012	8th Angeles National Forest 50k Trail Race	50,00	—
90	26/2/2012	2nd La Jolla Canyon 50 km Trail Run	50,00	—
91	23/10/2011	2nd Malibu Canyon 50 km Trail Run	50,00	—
92	6/3/2011	4th Malibu Creek Trail Run	50,00	—
93	20/11/2010	1st Los Pinos 50K	50,00	—
94	24/10/2010	1st Malibu Canyon 50 km Trail Run	50,00	—
95	21/8/2010	19th Bulldog 50k Ultra Run	50,00	—
96	7/3/2010	3rd Malibu Creek Trail Run	50,00	—
97	22/11/2009	5th Santa Monica Mountains 50 km	50,00	—
98	8/3/2009	2nd Malibu Creek Trail Run	50,00	—
99	23/11/2008	4th Santa Monica Mountains 50 km	50,00	—
100	18/5/2008	1st Sycamore Canyon 50K	50,00	—