Advent calendar day 18

Today I want the surname of an orienteer that due to his difficult name goes under several different nicknames in the orienteering world, among those Tero Kettunen. The runner has won two silvers and two bronze medals at the junior world orienteering championship and debuted in the senior world orienteering championships at the age of eighteen. The runner was for a period followed by bad luck during a yearly relay, where a bee, a dramatic injury and last a jumped over control, ruined three potential golds. In the twelfth attempt the gold medal was finally secured and an important medal was added to an impressive statistic.