Vettel, who won all four of his world championships with Red Bull, has gone 16 races without a victory and made some costly errors, while Hamilton has won 14 of the last 20.
The seven times Formula One champion says Ferrari cannot afford to fire any more blanks.
Lewis Hamilton stormed to pole position at the Brazilian Grand Prix on Saturday with Mercedes team mate and title rival Nico Rosberg joining the triple Formula One world champion on the front row. On a damp and overcast Sao Paulo afternoon, it was the 60th pole of the Briton's career, eight short of Michael Schumacher's record, and his first in Brazil since 2012 when he was at McLaren. With his title on the line, it was also one of Hamilton's most important in a roller-coaster season marked by mechanical setbacks.
Triple world champion Lewis Hamilton produced a moment of Montreal magic on Saturday to put his Mercedes on pole position for the Canadian Grand Prix and equal Ayrton Senna's career haul of 65.
Fresh from his 50th Formula One win, triple world champion Lewis Hamilton remains convinced anything is possible in the title race even if he could lose his crown as early as Sunday.
Finnish team mate Kimi Raikkonen, who started on pole for the first time in nine years but lost the lead in the pitstops, made sure of a Ferrari one-two with Hamilton finishing seventh for Mercedes after starting 13th.
