CNN  —  Chinese swimmer Yu Zidi has been described as a “sensation” after producing the fastest ever time by a 12-year-old in the 200-meter individual medley. Yu clocked a time of 2:10.63 at the Chinese National Championships in Shenzen on Sunday, finishing second behind two-time Olympic bronze medalist Yu Yiting. The time would have seen the younger Yu qualify for the semifinals at last year’s Paris Olympics and took almost two seconds off her personal best. “12-year-old sensation alert!”