The men's decathlon at the 2013 World Championships in Athletics was held at the Luzhniki Stadium on 10–11 August in Moscow, Russia.

[1] The first day ended with two Americans leading the competition, Olympic Champion and World Record holder Ashton Eaton and, surprisingly, World Junior Champion Gunnar Nixon who set a 15 cm personal record in the Long Jump, another in the Shot Put and led the field after the High Jump.

After an average showing, particularly in the Shot Put and High Jump, Eaton regained the lead with 46.02 400 metres.

[2][3] Eaton's expected rival[4] was defending champion and Eaton's Olympic runner up, American teammate Trey Hardee, who suffered from leg cramps and was only able to take slow, half-hearted attempts at the High Jump eventually no-heighting and dropping out.

Schrader scored big with his personal best in his lone attempt in the Javelin, but Eaton came through on his final throw to almost keep pace.