- [Events](https://oceanswims.nz/) - [2025–2026 Season](https://oceanswims.nz/2025/) - [Season Tallies](https://oceanswims.nz/2025/tallies) - William Nieuwenhuis # William Nieuwenhuis **Total distance:** 12.3km ## Season races - 2025-11-16, Sunday [Rylock Endurance Series Race 1 - Opening Splash](https://oceanswims.nz/2025/rylock-endurance-series-race-1-opening-splash) (2km - 30-39) - 2026-02-19, Thursday [Nelson Sea Swim Series - Race 15](https://oceanswims.nz/2025/nelson-sea-swim-series-race-15) (1.5km - 30-39) - 2026-03-01, Sunday [Rylock Endurance Series Race 3 - Ironman Challenge](https://oceanswims.nz/2025/rylock-endurance-series-race-3-ironman-challenge) (3.8km - 30-39) - 2026-03-29, Sunday [Rylock Endurance Series Race 4 - 5km challenge](https://oceanswims.nz/2025/rylock-endurance-series-race-4-5km-challenge) (5km - 30-39) ## Frequently close competitors - **[Glenn Clyne](https://oceanswims.nz/2025/swimmer/Clyne/Glenn)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 6.3% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 3.6% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 5.1% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 12.9% - **[Brian McGurk](https://oceanswims.nz/2025/swimmer/McGurk/Brian)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 1.2% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 7.3% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 7.6% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 13.1% - **[Jude Vincent](https://oceanswims.nz/2025/swimmer/Vincent/Jude)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 3.3% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 6.2% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 8.4% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 13.5% - **[Rob Boomer](https://oceanswims.nz/2025/swimmer/Boomer/Rob)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 7.5% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 7.7% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 13.9% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 19.3% - **[Altan Ní Mhurchú](https://oceanswims.nz/2025/swimmer/N%C3%AD%20Mhurch%C3%BA/Altan)** - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): You won by 4.9% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): You won by 6.1% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): You won by 9.6% - **[Hugh MacMillan](https://oceanswims.nz/2025/swimmer/MacMillan/Hugh)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 7.6% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 6.5% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 8.3% - **[James Blacklaws](https://oceanswims.nz/2025/swimmer/Blacklaws/James)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 6.6% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 4.9% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 12.8% - **[Maggy Johnston](https://oceanswims.nz/2025/swimmer/Johnston/Maggy)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): You won by 13.5% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): You won by 6.9% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): You won by 6.8% - **[Stephanie Gray](https://oceanswims.nz/2025/swimmer/Gray/Stephanie)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): You won by 5.9% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): You won by 10.1% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): You won by 13.0% - **[Jude Bishell](https://oceanswims.nz/2025/swimmer/Bishell/Jude)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 8.1% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 7.1% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 14.7% - **[Dave Loose](https://oceanswims.nz/2025/swimmer/Loose/Dave)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 8.5% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 14.0% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 15.5% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 19.6% - **[Kimberly Maclean](https://oceanswims.nz/2025/swimmer/Maclean/Kimberly)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 11.0% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 13.7% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 19.0% - **[Christina Harris](https://oceanswims.nz/2025/swimmer/Harris/Christina)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 17.8% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 18.2% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 20.0% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 24.3% - **[Jonathan Linyard](https://oceanswims.nz/2025/swimmer/Linyard/Jonathan)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 19.5% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 18.5% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 20.3% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 22.8% - **[Matt Pemberton](https://oceanswims.nz/2025/swimmer/Pemberton/Matt)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 19.7% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 17.4% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 20.4% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 23.2% - **[Craig Moore](https://oceanswims.nz/2025/swimmer/Moore/Craig)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): They won by 23.9% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): They won by 23.2% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): They won by 25.8% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): They won by 30.8% - **[Stephen Neas](https://oceanswims.nz/2025/swimmer/Neas/Stephen)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): You won by 1.2% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): You won by 0.1% - **[Nevin Price](https://oceanswims.nz/2025/swimmer/Price/Nevin)** - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): You won by 1.1% - 2026-03-01, Sunday Rylock Endurance Series Race 3 - Ironman Challenge (3.8km): You won by 1.1% - **[Stephen Taylor](https://oceanswims.nz/2025/swimmer/Taylor/Stephen)** - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): You won by 1.2% - 2026-03-29, Sunday Rylock Endurance Series Race 4 - 5km challenge (5km): You won by 2.1% - **[Eileen Searle](https://oceanswims.nz/2025/swimmer/Searle/Eileen)** - 2025-11-16, Sunday Rylock Endurance Series Race 1 - Opening Splash (2km): You won by 2.5% - 2026-02-19, Thursday Nelson Sea Swim Series - Race 15 (1.5km): You won by 0.9% Source: [Ocean Swims NZ](https://oceanswims.nz/2025/swimmer/Nieuwenhuis/William)