Having shocked the world of motorsport by announcing his retirement on Friday, Nico Rosberg has revealed he didn't know if he 'had the balls' to go through with it. Five days after winning his first Drivers' Championship, Rosberg broke the news that he was retiring from the sport. It was a decision that he in the build-up to last Sunday's championship triumph in Abu Dhabi but one he wasn't entirely sure he could follow through on come Monday morning. He did, informing his family and Mercedes before later telling Hamilton. 'The thing that gave me most clarity before Sunday's race was the thought of 'I'm actually going to win here today, this is going to be my last race so let's take it all...
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