Lewis Hamilton admits he considered retiring from Formula One, but says his current battle with Sebastian Vettel has renewed his motivation to stay in the sport.
Hamilton has won two of his three titles in the last three years and is in the running to become a four-time world champion this season. In June he broke Ayrton Senna's record for career pole positions and recently talked about attempting to match Michael Schumacher's win record of 91 race victories.
Although Hamilton has never confirmed it in public, he is believed to have considered retirement after colliding with former teammate Nico Rosberg at last year's Spanish Grand Prix.