EP 30. Caroline Wozniacki at age 16
Revisiting what the world's biggest stars were like in their early years before they experienced glory at the Olympic Games.
At home in Denmark with a 16-year-old rising tennis star Caroline Wozniacki back in 2006.
Usain Bolt is the greatest sprinter ever but as a hyperactive teenager in Sherwood Content in Jamaica he was not yet plotting Olympic glory.
Two of the greatest women players to grace a tennis court, Venus and Serena Williams have never lacked talent, drive, backing or confidence.
A trip back to Baltimore to see Michael Phelps reveal his brutal training regime shows why the swimming legend has 23 Olympic gold medals.
Grenada's first Olympic champion and medallist Kirani James has lived up to the hype which surrounded him back in his village of Gouyave.
As a teenager playing for hometown club Dynamo Moscow Alex Ovechkin was already destined to become an ice hockey superstar in the NHL.
Patty Mills was dreaming of playing in the NBA when he was 18 and learning his trade at the Australian Institute of Sport in Canberra.
As a young teenager in Brisbane, swimming star Emily Seebohm was a "pleasure" to coach and was already planning for the Olympics.
American gymnast Nastia Liukin has a fine sporting pedigree through her parents and as a teenager in Texas she wanted to follow their lead.
Sporting talent runs in Rafael Nadal's family, but by his mid-teenage years the mult-talented Spaniard was on the path to tennis stardom.
Allyson Felix was a humble Los Angeles teenager in 2003, but the American sprint legend was on the verge of becoming a world-class athlete.
In 2001 tennis legend Roger Federer was yet to reach the world's top ten or win a Grand Slam, but the Swiss star was making a big impact.
Legendary gymnast Alina Kabaeva moved to Moscow with her parents to help her career at 12, and by 2000 the decision was proving a smart one.
By her mid-20s British track cyclist Victoria Pendleton was an international class rider but had yet to make an impression at Olympic level.
British diver Tom Daley was causing a media frenzy just before his Olympic debut in 2008, but his late father Rob was keeping him grounded.
A giant on the court and in stature, Yao Ming is a Chinese basketball legend but in 1999 he had work to do before achieving his NBA dream.
Veronica Campbell-Brown's schooling in her hometown of Clarendon, Jamaica brought discipline and the inspiration to become a sprint legend.
Neymar had only just turned professional in 2009 but his outstanding talent ensured he was expected to become a Brazil football legend.
Five years before her Olympic gold at London 2012, Colombian BMX rider Mariana Pajon was already a ten-time junior world champion.
Yelena Isinbaeva was a junior world champion in her hometown of Moscow in 1998 despite only taking up pole vaulting six months earlier.
Olympic bronze medallist and Indian badminton star Saina Nehwal first started her career living and training in Hyderabad.
Seven-time Olympic medallist and Japanese legend Kohei Uchimura at age 21.
A profile of U.S. basketball star Candace Parker when she was training at the University of Tennessee under head coach Pat Summitt.
At home in Sweden with heptathlon great Carolina Kluft before she won gold at the 2004 Athens Games.
The most decorated female Olympic alpine skier in U.S. history was destined for stardom at an early age.
The story of the Swedish star years before she became her country's first female swimmer to win an Olympic gold medal.
A profile on Japanese Table Tennis sensation Ai Fukuhara when she was 16 and living and training in Aomori.
Long before she won Olympic silver in Golf's debut in Rio, Ko was already one of the game's hottest prospects.
Catching up with Qatari high jumper and two-time Olympic medallist Mutaz Essa Barshim back in Doha when he was 19.
With five Olympic medals to her name, including three golds, Martina Sáblíková is the Czech Republic’s greatest-ever speed skater.