Brett Morse is out of the Olympic discus competition, registering only one legal throw of just 58.18m in qualifying, down on his season's best of 64.35m.
Morse said his performance was "very disappointing really".
He added: "In the first round I walked in and wound up and the crowd just went mental so I was a little nervous on that throw. I didn't actually hit any of the throws properly.
"I think I just rushed the finish, I was a little excited maybe, I don't know."