China's Jiao Liuyang won the women's 200- meter butterfly Wednesday night with a burst after the last touch.
Mireia Belmonte Garcia led after the 100 and 150 marks but Jiao closed with a final split more than two seconds faster than the Spaniard to set an Olympic record with a time of 2 minutes, 4.06 seconds.
It shaved .12 seconds off 2008 gold medalist Liu Zige's old mark.
Japan's Natsumi Hoshi won the bronze while Americans Kathleen Hersey and Cammile Adams were fourth and fifth. Hersey missed a medal by .30 seconds. Liu was eighth.