Karel Sabbe leading at the Barkley Marathons

Sabbe is the first to head out for a fourth loop, completing three loops in 32 hours

Barkley runners Courtney Dauwalter and Harvey Lewis drop out on loop two

Karel Sabbe and John Kelly are nearing three loops as five runners remain

27 Barkley Marathons runners begin loop two

John Kelly and Karel Sabbe are leading the pack