Swimmer Park Tae-hwan will enter the men\'s 400-meter freestyle race Saturday, the first of his three events at the London Olympics. He is the reigning Olympic gold medalist and a two-time world champion in 400? free. Park isn\'t the only South Korean medal hopeful on this day. Male archers will compete in the team event, and they\'ve earned the bye to the quarters after setting the world record in team score with 2,087 in the ranking round Friday.