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ISTANBUL (AP) — Lithuanian teen Ruta Meilutyte won her second gold medal at the short-course world championships on Saturday in her London Olympic gold-medal event, the 100-meter breaststroke.

The 15-year-old Meilutyte won in in 1 minute, 3:52 seconds, beating the championship record of 1:03.98 set by Rebecca Soni of the United States in Dubai in 2010. "It didn't go the way I wanted this morning (in the heats), finally I got it right now. That was the main thing," Meilutyte said. "It's the first time I'm actually really happy with my race, with the splits and the process. Even if I came last, I would be as happy as I am now."

Alia Atkinson of Jamaica took the silver medal in 1:03.80 and Rikke Pedersen of Denmark was third in 1:04.05. Another championship record was set by Brazil's Nicholas Santos, who won the 50 butterfly in 22.22. Chad Le Clos of South Africa got the silver in 22.26 and Thomas Shields of the United States finished third in 22.46.

Robert Hurley of Australia won the 50 backstroke in 23.04, even though Stanislav Donets of Russia was a heavy favorite after clocking the fastest time in the semifinals. Matt Grevers of the United States came second in 23.17 and Donets won bronze in 23.19.

"The backstroke is really about who is best underwater," Hurley said. "I pride myself in being very good under water, so I am glad I proved that tonight." Donets said he had trouble with his left shoulder this summer and only started training again two months ago.

In Saturday's last finals, the United States won the women's 4x100 freestyle relay when the quartet of Megan Romano, Jessica Hardy, Lia Neal and Allison Schmitt finished in 3:31.01, followed by Australia and Denmark; and Shiwen Ye of China powered to the 200 individual medley title with a championship record of 2:04.64, ahead of Katinka Hosszu of Hungary and Hannah Miley of Britain.

"I competed against her many times in many events," Ye said of Hosszu. "Racing against Hosszu made me swim faster."