In this edition of the Challenger Vault, Lleyton Hewitt discusses the importance of the ATP Challenger Tour and reflects on winning his lone title at the age of 17.
When Roger Federer began 2017 at No. 17 in the ATP Rankings, his return to World No. 1 seemed like a fairytale. But more than 14 years after he first sat atop the tennis world in 2004, the Swiss is now back at the summit.