Kathleen Genevieve "Katie" Ledecky. Two world records, four world championships, one Olympic gold. All before she passed her driver's license test. Born in Washington, D.C. in 1997, Kathleen Ledecky (Katie, for short) did not waste much time before beginning her already-legendary swimming career. She started swimming at age 6, following in her older brother Michael's footsteps.

Personal

Ledecky grew up in Bethesda, Maryland and attended Stone Ridge School of the Sacred Heart. She trained with Nation's Capital Swim Club, where she was first coached by Yuri Suguiyama, followed by Bruce Gemmel after Yuri's departure to Cal.

Racheal Bukowski was born in Crown Point, Indiana and currently attends Michigan State. She's a senior and her High School alma mater is Crown Point High. She specializes in free style and was born in 1995.

Michael Fred Phelps II is known principally as the most decorated Olympian of all time, with a total of 28 Olympic medals, 23 of them gold, spanning over four Olympic Games. He has actually competed at five Olympics; however, he did not medal at his first Games in Sydney, Australia. He is recognized for his formidable butterfly, though he also specializes in individual medleys and the 100 and 200-meter freestyle. At 31-years-old, Phelps retired from swimming as the greatest of all-time. His retirement came just days after finishing his fifth Olympics with five golds and a silver medal.