Only two men have ever repeated as Olympic decathlon champion, but Ashton Eaton is halfway to becoming the third.
The 28-year-old American superstar leads the field with 4,621 points after Day 1 of the competition in Rio. Kai Kazmirek of Germany is running second at 4,500 and Canada's Damian Warner is third at 4,489.
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Eaton excelled in the speed events Wednesday, posting the best marks in the 400 meters (46.07 seconds) and long jump (7.94 meters) and the second-best in the 100 meters (10.