Wolff reveals Hamilton's happiness
Mercedes chief Toto Wolff says the fact Lewis Hamilton is happy and settled off the track helps him be successful in F1.
The Briton claimed his fifth Formula 1 world title in 2018 as he dominated his rivals throughout the year.
Wolff paid tribute to the Mercedes star and believes the fact that he's doing well in other aspects of his life - like in launching a successful partnership with fashion designer Tommy Hilfiger - fuels his ability to win races.
"I think that what is happening is that he constantly develops, there is no stand still," Wolff told Motorsport.com.
"He is improving in every area. He is improving on track, he is improving off track, and his partnership with Tommy Hilfiger is very successful. It is one of the best performing fashion collections from the Hilfiger brand.
"So he is building up a second pillar of activity that is more than a hobby already, and therefore that has added another building block to making him a complete sportsman. It makes him happy. And if you are happy then you perform well."
Aidan Perkins is a senior journalist that specialises in football stories. Aidan, a Liverpool fan, also has a broad knowledge of several other sports.