Kazami Breaks 100 km World Record at Lake Saroma On the same course, on which the Japanese Takahiro Sunada made the 100 km world record of 6:13:33 h: Min: S 20 years ago, the marathon runner Nao Kazami defeated a hard and hard-fought field to the 100 km ultramarathonLake Saroma win with the new world record of 6:09:14 H: min: s. See https://japanrunningnews.blogspot.com/2018/06/kazami-breaks-100-km-world-record-at.html?m=1