Lewis Hamilton said he was amused by younger rivals talking up their chances as his Mercedes Formula One team unveiled the new car that could make him a seven-times world champion this season. The 35-year-old Briton pointed to Finnish teammate Valtteri Bottas, who took the first laps in the sleek W11 car at a private shakedown session at Silverstone circuit on Friday, when asked who would be his biggest challenger. Red Bull's Dutch driver Max Verstappen and Ferrari's Monegasque Charles Leclerc, both 22 years old, are hungry to seize Hamilton's crown, but the reigning champion said he was relaxed.