Do a Devon Loch
The idiom is often used while talking about sports or athletes.
She had always been a brilliant student, so everyone was surprised when she did a Devon Loch and came in last.
It was shocking how Liverpool did a Devon Loch at the match against Manchester United. We were all expecting them to win!
At just a couple of points away from winning, it will be a Devon Loch if Serena Williams loses this match.