Check out our collection of videos found on YouTube of professional players when they were younger. It’s interesting to see how they’ve developed physically and technically.

1. Juan Martin Del Potro

2. Rafael Nadal

3. Grigor Dimitrov

4. Venus & Serena Williams

5. Dennis Shapovalov

6. Maria Sharapova

7. Victoria Azarenka

8. Roger Federer

9. Gael Monfils

10. Andy Roddick

11. Alexander Zverev

12. Stan Wawrinka

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