Mercedes driver Lewis Hamilton (left) sprays champagne over the face of teammate Nico Rosberg on Sunday. Pic/AP, PTI

Sao Paulo: Lewis Hamilton warned Nico Rosberg he was "hunting" a fourth world title after describing his stunning triumph in Sunday's wet and chaotic Brazilian Grand Prix as one of the easiest of his 52 career victories. The 31-year-old Briton won in Brazil for the first time at the 10th attempt to complete a hat-trick of consecutive wins and keep alive his championship defence, taking the title battle down to the wire at the final race, the Abu Dhabi Grand Prix on November 27.