The 41st edition of the annual Mizuno MR25 Ultra Marathon took place on 30 December, 2018. Held at Macritchie Reservoir the race is only considered finished when the participant completes 5 laps of 10.35km (approx) each, totalling 51.75km (approx). The winner is the person that completes the most laps within the race’s 12 hours period.