is a Japanese former long-distance runner. He was a world-class marathon competitor in the 1980s. He represented his native country at the 1984 and the 1988 Summer Olympics in Seoul, South Korea. Seko's notable marathon wins include Fukuoka Marathon (1978–1980, 1983), Boston Marathon (1981, 1987), London Marathon (1986) and Chicago Marathon (1986). On March 22, 1981 Seko set world records at 25,000 m (1:13:55.8) and 30,000 m (1:29:18.8). The records stood for 30 years, until they were broken by Moses Mosop in June 2011. On April 20, 1981, Seko shaved one second off Bill Rodgers's course record at the Boston Marathon. , Seko is a coach at the S & B Foods Track Team, and a member of the Tokyo 2016 Olympics Advisory Panel. He serves on the Tokyo Metropolitan Government Board of Education from December 21, 2007. He was devoted to the sport above other interests and once remarked "The marathon is my only girlfriend. I give her everything I have." International competitions Marathons See also List of winners of the Boston Marathon References 1956 births Living people Sportspeople from Mie Prefecture Japanese male long-distance runners Japanese male marathon runners Olympic male marathon runners Olympic athletes of Japan Athletes (track and field) at the 1984 Summer Olympics Athletes (track and field) at the 1988 Summer Olympics Asian Games bronze medalists for Japan Asian Games medalists in athletics (track and field) Athletes (track and field) at the 1986 Asian Games Medalists at the 1986 Asian Games Japan Championships in Athletics winners Chicago Marathon male winners Boston Marathon male winners London Marathon male winners World record setters in athletics (track and field)