Mercedes driver Lewis Hamilton chose Fernando Alonso as his toughest rival in Formula 1.
— I remember the task of being close to Fernando when I was 22 years old. I was so young mentally and, of course, good in terms of technique, but it’s a lot of pressure to face an opponent like Fernando. I would say at a clean pace, Fernando is the toughest. We had some good fights,” Hamilton told reporters at Paul Ricard.
Hamilton made his F1 debut in 2007, with Alonso as his teammate that season.
Source : MatchTV

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