American gymnast Simone Biles needs three more medals in the World Championship to become the most decorated gymnast, among both men and women athletes. 

Another three medals will push Biles ahead of leader Belarus' Vitaly Scherbo's tally of 23 World Championship medals. Biles won record 21st World Championship title as the U.S. clinched their fifth straight team title on Tuesday in Stuttgart. 

It was Biles' 15th career gold medal, but in terms of overall medals at the World Championship, she went past Russian gymnast Svetlana Khorkina’s tally of 20. Putting her achievement into perspective, no gymnast has ever won more than nine gold medals at this level.

The 22-year-old athlete, who has qualified for all five individual finals, could well repeat her feat from last year's world tournament, where she won medals in each of the six events she had participated in. 

"I never think of records - I just go out there and do what I came to do. Every year it feels better and better, just because we're adding to the legacy," Biles, who also won three silvers and three bronzes at the World Championships, said. 

Simone Biles Simone Biles competes on the balance beam during Women's qualification for Artistic Gymnastics on Day 2 of the Rio 2016 Olympic Games. Photo: Getty

The U.S. side scored 172.330 points as they defeated second-placed Russia by 5.801 points. It was their seventh consecutive team title at an Olympics or world championships.

The win earned them a battery-powered medal that lit on sensing movement. However, Biles called it "the sickest medal we have ever had."

Biles recorded the best individual scores in the categories of the vault, balance beam and floor.

"It's just so surreal to come out here and end up on top with the strength of the team that we have, even after having a couple falls out there. I think if I do the routine that I did tonight I'll be more than happy in Thursday's individual all-around final," the American added.