Sebastian Vettel says he will not approach the season-ending Brazilian Grand Prix any differently from previous races, despite having a significant lead over Fernando Alonso in the Formula One drivers\' championship. Vettel said yesterday that he doesn\'t plan to play it safe in Sao Paulo even though a fourth-place finish will be enough to secure the Red Bull driver his third-straight F1 title on Sunday. Vettel has a 13-point lead over the Ferrari driver, who said he will focus on a good finish at the Interlagos track before worrying about what Vettel is doing. If Vettel clinches the title, he will join Michael Schumacher and Juan Manuel Fangio as the only drivers to win three championships in a row. He also would be the youngest to do it, at age 25. The 31-year-old Alonso, also seeking his third F1 title, said his goal is to try to have a \"normal weekend\" and not worry about Vettel too much. He said he needs a podium finish to guarantee enough points to overcome Vettel if the Red Bull driver runs into trouble at the tricky Interlagos track. \"Obviously it will be good to be in the podium and score a minimum 15 points and then when we cross the line we see where Sebastian is and we try to do some numbers after that,\" the Spaniard said.