Kenichi Ito of Japan has broken his own Guinness world record - for running on all fours in the 100-meter dash. Ito finished in 16.87 seconds today, shaving more than half a second off his 2012 run of 17.47 seconds.
Usain Bolt of Jamaica won his second straight Olympic gold medal in the men's 100 meters Sunday, crossing the line in an Olympic-record 9.63 seconds.
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