Vettel 'not stressing' as F1 lead slips away

F1 - Formula One - British Grand Prix 2017 - Silverstone, Britain - July 15, 2017 Ferrari's Sebastian Vettel REUTERS/Jason Cairnduff

BUDAPEST (Reuters) - Sebastian Vettel says he is keeping calm ahead of a Hungarian Grand Prix weekend that could see the Ferrari driver surrender his Formula One championship lead to Mercedes rival Lewis Hamilton.

The German, a four times world champion with Red Bull, goes into the last race before the August break a point ahead of Hamilton, who will take over at the top for the first time this season if he seals a record sixth win at the Hungaroring.