SAO PAULO – Sebastian Vettel found himself spinning around on the track just after the start, watching helplessly as other cars whizzed past him. His Formula One title hopes seemed to be drifting away with them.

It was only the start of Vettel’s problems Sunday in what he called the toughest race of his career. But he overcame all of them and came away with the only prize that mattered – his third straight championship title.

Vettel shook off a first-lap crash and other difficulties to finish sixth at the Brazilian Grand Prix, good enough to protect his lead over challenger Fernando Alonso and become F1’s youngest three-time champion at age 25.