Dianas co-worker Robin. He somehow thought that by following the most likely winner the entire race, he would manage to sprint past him in the end and win. Some people are simply born naive as he finished close to last due to premature exhaustion.
Robin finally made it to the end, though after walking most of the way. He's trying to make it look better than it is by sprinting the last 50 meters. Robin..the clock does not lie, no matter what you do.