Lewis Hamilton has suggested he will look back on his career as a failure if he does not add to his solitary Formula One Drivers' title. The Briton heads into the new F1 season, which gets underway in Melbourne next weekend, aware that his McLaren team is under pressure. The MP4-26 has looked off the pace in testing and has completed less miles than any other team. Red Bull's Sebastian Vettel is the bookmakers' favourite to defend his title, with Ferrari's Fernando Alonso next best, while Hamilton's chances are viewed as those of an outsider following a tough pre-season. The 26-year-old is happy with life at McLaren, claiming he feels privileged to be part of the team, but has warned that he will not tolerate mediocrity. Read more: http://en.espnf1.com/f1/motorsport/story/43635.html