The grueling Arrowhead 135 endurance race from International Falls to Tower was decided by a single second Monday night - and the lead pack of riders shattered the course record.

Ted Loosen of Minneapolis rode his bike across the finish line at 8:15 p.m. with a time of 13 hours, 15 minutes for the 135-mile course. John Lackey of Washington state was just a second behind Loosen, with third-place finisher Ben Doom of St. Cloud just 15 seconds off the lead.

Newsletter signup for email alerts

The previous top mark was 14 hours, 20 minutes, set by Duluth's Todd McFadden in 2013.

A field of 156 competitors - 84 cyclists, 61 runners and 11 skiers - began the 13th annual race on Monday morning, and most remained on the trail Monday night.

The cutoff to reach the finish at Fortune Bay Casino is 60 hours, or 7 p.m. Wednesday.