McKayla Maroney was heavily favored to win the gold in the women's vault in London, but as she came down on her second run her feet slid forward on the landing and she fell to the mat.
Maroney's first vault was the Amanar - a roundoff onto the takeoff board, back handspring onto the table and 2.5 twisting somersaults before landing. She had perfect form in the air, but took a hop on her landing, and came down out of bounds. She was deducted 0.3, but still scored a 15.866 with a 9.666 for execution.
The gold was all hers if she could land another great vault.
But on the second one, she seemed to land on the back of her heels. Her feet slipped forward and she dropped to the mat. She scored a 14.3, for an average of 15.083.
The rare error by Maroney opened the way for Romania's Sandra Izbasa and she took advantage of it winning gold on Sunday. Maroney won the silver medal and Russia's Maria Paseka took bronze.
Maroney had this to say via Twitter: "I really didn't deserve to win a gold medal if I fall on my Butt" and "it happens, it's gymnastics. You can't be perfect and sometimes things don't go as you planned...I messed up."