THEN AND NOW: What the world's biggest sports stars looked like as youngsters
Just 16 years old when he made his professional debut in 2003, Lionel Messi has since played over 700 games for FC Barcelona.
Lebron James has taken away the headband, but added tattoos, a beard, and plenty of muscle since high school.
Serena Williams was winning trophies in 1991, and she is still doing the same in 2020.
Not a lot has changed for the ageless Tom Brady over the past two decades, including his team and shirt number.
Cristiano Ronaldo in 2003: skillful, fast, goal scoring machine. Cristiano Ronaldo in 2020: skillful, fast, goal scoring machine.
Floyd Mayweather has stayed in astonishing shape since making his professional boxing debut in 1996.
Simone Biles has lost her braces since 2013, but has picked up four Olympic gold medals in exchange.
Roger Federer sports a much cleaner hairstyle these days compared to the one he rocked in 2000.
29 years ago, a 16-year-old Tiger Woods won the Los Angeles Junior Championship at Griffith Park.
Megan Rapinoe made her debut for the USWNT 13 years before guiding it to World Cup glory in 2019.
Giannis Antetokounmpo went from NBA rookie in 2013 to the league's MVP in just six years.
Rafael Nadal has the same competitive streak today as he did as a 14-year-old boy in 2000.
Different sports, same outcome —Ronda Rousey was a Judo champion before she rose to the pinnacle of the UFC and the WWE.
Aaron Rodgers was playing for the University of California in 2002, but is now an NFL all-time great.
Irishman Conor McGregor is barely recognizable from his 2012 days as a Cage Warriors fighter with a shaved head.
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