Chinese teenager Ye Shiwen added the world short-course 200-metre individual medley title to her two Olympic golds when she clinched victory in two minutes, 4.64 seconds in Istanbul. Ye, 16, who took Olympic gold in the 200m and 400m medleys in London, beat Hungary's Katinka Hosszu and Hannah Miley of Great Britain. "I'm so happy I came in first today. It feels so good," Ye said, after setting the championship record. "I competed against Hosszu many times in many events. This time she was stronger than ever. But I thought for sure I won't give up. I had a chance to come back because in the breaststroke she is not so strong." Ye stunned the sport at the London Olympics when she captured gold in the 200m and 400m medleys. United States swimmer Ryan Lochte kept up his phenomenal form at the championships when he set a world record 50.71 seconds in the men's 100m individual medley semi-finals. A day earlier, the five-time Olympic champion rewrote the 200m individual medley world record on his way to winning his fourth gold of the titles. In his latest record swim, he was already under world record time by the end of the start-up butterfly leg and continued to eat into it over the following three laps. Australia's Kenneth To was second fastest in 51.47 and George Bovell of Trinidad and Tobago was third with 51.66. "I messed up in a couple of places tonight so I know there is some room for improvement," said Lochte, who knocked .05 seconds off the mark set by Slovenia's Peter Mankoc in 2009. Ruta Meilutyte added the 100m breaststroke title to the 50m breaststroke gold that she won earlier in the week as she dominatedto win with a new championship record of 1:03.52.