World sport has come leaps and bounds in the last couple of decades with most athletes turning professional on their way to the top.
A career in sport can have many benefits, especially with the amount of money involved today, athletes can become millionaires overnight.
Here’s the world’s greatest sports stars on their debut compared to what they look like today.
1. Andre Agassi
The retired American has had a noticeable change since he made his professional debut in 1986.
The former number one lost all his hair during the latter stages of his playing career.
2. Rafael Nadal
The Spaniard hasn’t changed too much since making his professional debut in 2001.
Nadal is currently the world number five and worth an estimated $100 million.