Mercedes boss Toto Wolff admits that it would be a "nightmare" were Lewis Hamilton to suffer a car failure in Sunday's Abu Dhabi Grand Prix.

Although Nico Rosberg still has a chance of winning the title, not least courtesy of the double points scheme, many, including Pitpass' own Mike Lawrence believe Hamilton to be the moral winner already due to his 10 wins to the German's 5.

Indeed, based on another of Bernie Ecclestone's proposals, that of the championship being decided on medals awarded to drivers; much like The Olympics, on the basis of gold for a win, silver for second... the title would already belong to the Briton.

However, looking ahead to this weekend's season finale, and mindful of the technical problems Hamilton, in particular, has encountered this season, Wolff is fearful of the Briton losing out due to a car failure.

"Clearly Lewis breaking down would be a nightmare," said the Austrian, according to the BBC. "We want the championship to end in a straight and fair battle and not by one of them breaking down.

"If there was a DNF, a technical issue, it would put a big shadow over the championship," he added. "I want to see a straight fight between the two of them.

In addition to his fears of a DNF, Wolff remains a critic of the double-points rule which could still decide the destination of the title.

"We have had a big backlash from the fans and many vocal personalities who don't like the system," he said. "I have been a racing driver myself and I wouldn't have wanted to have double points. The decision we all took together probably wasn't the right one and we need to change it for the future. But the rules are how they are and whoever scores the most points will be the world champion."

Though he fears Hamilton suffering a car failure, Wolff insists he remains neutral and doesn't mind which of his driver wins the title on Sunday.

"I care about both of them in an equal way," he said. "They are both great for our brand because they are different personalities and great racing drivers so it doesn't matter who becomes world champion."