Leila Vaziri born June 6, 1985 is an American competition swimmer, the 2007 world champion, and a former world record-holder in the 50-meter backstroke.At the 2007 World Aquatics Championships held in Melbourne, Vaziri won a gold medal in the 50-meter backstroke and earned a silver medal by swimming the backstroke leg in the heats of the 4×100-meter medley relay. Going into the final of the 50 m backstroke, Vaziri was the clear favorite for gold. In the heats of the 50 m backstroke, Vaziri broke Natalie Coughlin’s Championship record of 28.30 with a time of 28.25 establishing a new American Record.In the semifinals of the 50 m backstroke, she broke Janine Pietsch’s world record of 28.19 with a time of 28.16. In the final of the 50 m backstroke, she equalled her own world record en route to winning gold.Vaziri came short of making the 2008 USA Olympic Swimming Team when she finished in 7th place in the final of the 100 m backstroke at the 2008 U.S. Olympic Team Trials.