The time of 4.53.35 would have been enough for fourth place at the Olympic Games in Paris last summer.
More and more indicates that the young Chinese woman will be the big sensation there.
Last night's performance came just a few days after the gold on 200 meters butterfly – with the almost incredible time of 2.06.83 considering her age.
Even that time was the fifth fastest in the world this year and would have been enough for a place just outside the medal podium in Paris.
My lungs were about to explode. I had no idea about my time. I focused solely on the race, she said tonight to the state-run Chinese news agency Xinhua.
Yu started the Chinese championships by coming second on 200 meters medley. Also that on a time that would be enough to qualify for the World Championship.
It would be cool to compete internationally with the national flag on the uniform, she says.
The Chinese Swimming Federation will soon select the World Championship team.
