Japan's top Olympic swimmer Daiya Seto has been barred from competitions and official training until the end of the year as punishment for an affair exposed by a tabloid. The star athlete was caught on camera in September by a gossip magazine, which chronicled the married 26-year-old's movements as he picked up his girlfriend, took her to a "love hotel", then went to pick up his daughter from nursery. Seto apologised for his "irresponsible behaviour" in a statement on Tuesday, saying he accepted the sanctions from the Japan Swimming Federation, which include events at home and abroad.