Mary Lou Retton was one
Before Mary Lou Marcia Frederick and Tracee Talavera earned '10's' on bars in 1979,
First American woman to earn a "10" in the Olympics was Mary Lou's teammate Julianne McNamara won 2, on bars and then floor, before Mary Lou earned her's on vault.
The first AMERICAN gymnast to score a perfect '10' was Mitch Gaylord in 1984
The first female gymnast to get a full 10 on 10, is the Romanian gymnast Nadia Commenci.
Nadia comaneci
The first olympic gymnast to get a perfect 10 was Albert Sequin. He got it on the sidehorse and his score was 10000.
Nadia Comăneci of Romania was the first female gymnast to score a perfect 10 in a major competition. She did so at the 1976 Summer Olympics in Montreal, Quebec, Canada.
Shawn Johnson is one of the best American Gymnasts. Nastia Liukin is very good too. But, Nadia Comaneci was the first gymnast to get a perfect 10 in Olympic Gymnast history.
Nadia Comaneci was the first gymnast to score a perfect 10 in Olympic competition.
Nadia Comaneci, A Romanian Gymnast, winner of 3 olympic gold medals was the first ever to achieve a perfect 10 in Gymnastics.
Albert Sequin. He was also the first to get a perfect 10.
Romania
The 2nd person to receive a perfect 10 is Nellie Kim.
Nadia Comaneci.