Self-Transcendence Ten-Day winner
Covered 1,363.763 km to win the ten-day race in Moscow.
Source-checked athlete record · Updated Aug 17, 2026
Ivan Zaborsky
1,047.554 km six-day performer and 2026 Moscow ten-day champion
Ivan Zaborsky covered 1,047.554 km in six days in 2025 and won Moscow’s 2026 ten-day race with 1,363.763 km.
🇷🇺 RussiaMoscowM35–39
The record so far
Ivan Zaborsky is a Russian fixed-time, multiday, and backyard ultrarunner from Moscow. At the 2025 GOMU Six-Day World Championship in France, he covered 1,047.554 km, finishing first and exceeding Matthieu Bonne’s ratified IAU world best by 2.035 km.
The 2025 performance has been described as a world record by GOMU and iRunFar. As of this profile’s August 2026 verification, however, the IAU record list still names Bonne’s 1,045.519 km as the current ratified world-best performance and does not list Zaborsky’s mark as pending. The two statuses are therefore presented separately.
Zaborsky extended his multiday record in 2026. He won the BUFF 72-Hour World Cup with 559.578 km and the Self-Transcendence Ten-Day Race in Moscow with 1,363.763 km, while also recording 811.426 km at the 123-hour Biotropika Ultra Trail.
Defining performances
Performance history
| Date | Event | Performance | Result | Source |
|---|---|---|---|---|
| Self-Transcendence Ten-Day Race MoscowTen-day road | 1,363.763 km | Winner | View ↗ | |
| Biotropika Ultra Trail123-hour backyard-style ultra | 811.426 km | 3rd overall | View ↗ | |
| BUFF 72-Hour World Cup72-hour road | 559.578 km | Winner | View ↗ | |
| Brazil 135 Ultra Journey240 km journey race | 29:37:57 | Winner | View ↗ | |
| Biotropika Ultra TrailBackyard ultra | 106 yards · 710.836 km | Winner | View ↗ | |
| GOMU Six-Day World ChampionshipSix-day road | 1,047.554 km | Winner · Organizer-recognized world record | View ↗ | |
| Authentic Phidippides Run490 km road | 52:52:28 | Winner · Course record | View ↗ |
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