World champion Lewis Hamilton expects a tougher challenge from Ferrari in Formula 1 this season. Ferrari had the car to win the 2018 title but fell away after a series of errors, with Hamilton taking a fifth championship for Mercedes. But Ferrari impressed with strong pace at the start of pre-season testing. Hamilton said: "Ferrari are very strong. It appears they have a better package than last year, which means it will be a bigger challenge for us." But the 34-year-old cautioned that it was premature to jump to too many conclusions after just two and a half days of pre-season testing.