Every tennis player dreads their ultimate bogey opponent—from Monfils' endless losses to Djokovic, Sinner's Medvedev turnaround, and Roddick's Federer trauma.
In October 2013, Novak Djokovic was no longer world number 1. Unsettled by his defeats against Rafael Nadal, he decided to shake things up. Boris Becker recounts how a simple phone call marked the beginning of a historic collaboration.