World champion Sebastian Vettel won the Korean Grand Prix on Sunday, in a Red Bull one-two finish to take the overall Formula One lead from Ferrari’s Fernando Alonso with four races remaining, according to Eurosport. Vettel’s third win in a row, fourth of the season and 25th of his career, left him on 215 points with third-placed Alonso now on 209.Australian Mark Webber, who had started on pole position but was overtaken by his team mate off the grid into the first corner, finished second to anchor the first one-two of the season by any team. “The start was very important. we started from the dirty side,” said Vettel. “I had a very good launch and could see that Mark was struggling a little bit. I was able to get side by side and then had the inside into turn one. “It was a perfect start for myself,” added the German, who spent the closing laps fretting about the tyres and making sure they held up.With no need to attack his title-chasing team mate in the closing stages, Webber finished 8.2 seconds behind Vettel.