Compare
Athlete head-to-head
Compare career records, current form and shared race results. Use athlete slugs, names, or profile IDs.
Battle read
Stored head-to-head is tied
Last 4 shared: Niek Heldoorn 2, William Mennesson 2. This only counts races where both athletes have stored results.
Win share
Niek Heldoorn
50%
Win share
William Mennesson
50%
Latest shared race
2026 Ironman 70.3 Valencia
4/18/2026 · edge Niek Heldoorn
6
Niek Heldoorn
35
William Mennesson
Head-to-head
Niek Heldoorn vs William Mennesson
Head-to-head tied: 2-2 across 4 shared starts
Last 4 shared: Niek Heldoorn 2, William Mennesson 2
Latest shared race: 2026 Ironman 70.3 Valencia - edge Niek Heldoorn
Career starts: Niek Heldoorn 18, William Mennesson 45
Career wins: Niek Heldoorn 3, William Mennesson 3
18
Starts
45
3
Wins
3
8
Podiums
6
12
Top 10s
21
#1
Best
#1
#8.4
Avg pos
#13.7
1103
Points
2108
2
Niek Heldoorn head-to-head wins
4
Shared race starts
2
William Mennesson head-to-head wins
Shared races
Only races where both athletes have a stored result are shown.
2026 Ironman 70.3 Valencia
4/18/2026
6
Niek Heldoorn
3:39:35
35
William Mennesson
3:49:41
2025 Ironman Frankfurt
6/28/2025
29
Niek Heldoorn
9:00:37
26
William Mennesson
8:35:42
2023 Ironman Lanzarote
5/19/2023
2
Niek Heldoorn
8:24:47
16
William Mennesson
11:12:47
2022 Alpe D'Huez L
7/27/2022
9
Niek Heldoorn
6:09:53
8
William Mennesson
6:09:18
| Race | Niek Heldoorn | William Mennesson | Edge |
|---|---|---|---|
| 2026 Ironman 70.3 Valencia 4/18/2026 | 6 3:39:35 | 35 3:49:41 | A |
| 2025 Ironman Frankfurt 6/28/2025 | 29 9:00:37 | 26 8:35:42 | B |
| 2023 Ironman Lanzarote 5/19/2023 | 2 8:24:47 | 16 11:12:47 | A |
| 2022 Alpe D'Huez L 7/27/2022 | 9 6:09:53 | 8 6:09:18 | B |