Mercedes boss Toto Wolff says his two drivers know how to behave in the first corner but has warned them against a repeat of the contact they made at the U.S. Grand Prix one week ago.

The run down to Turn 1 in Mexico is one of the longest of the season and Nico Rosberg and Lewis Hamilton will line up alongside each other on the grid. In Austin the pair made contact, but Wolff is confident his drivers will behave this weekend.

"So we are used to Turn 1," he said. "It's always tricky when it's so close between team-mates or close between racing cars in general. This is why we are here, we want to see them race and not pre-agree before the race even started who goes first through the corner and who goes second. It would make the whole thing much less exciting.

"For us as a team it's always a challenge. We continue to support them in racing hard and optimising the result, but of course for the team it is very important to have no controversy in the team and obviously if the cars collide that's causing controversy. If it's getting a tiny bit too hard it's causing controversy as well. There's no need to discuss it tomorrow again, we've had conversations regularly, we've had discussions after Austin and they are both absolutely aware of the situation."

Wolff sat down with his drivers to discuss Austin, but says he does not want every incident between the two being dragged out through the media.

"How many pages of rules do we need to come up with to really cover every single situation," he said. "Yes we've had the conversation around Turn 1 and it doesn't need to be dragged out in the media how that's happening because I am not the headteacher and they are the best two drivers out there. At a certain stage the responsibility needs to be in their hands.

"Sometimes it's harder, sometimes it's trickier for us but the fundamental rule remains the same that we don't need any controversy in the team and we don't want any tension in the team because there are 1200 people who are the best in the world in their particular business and everybody needs to understand that and they do."

Rosberg starts from pole position, but Hamilton thinks there could be an advantage from starting second.

"Coming into the weekend I thought about if I was on pole how difficult it would be to hold off the person behind because it is a long way to slipstream someone," Hamilton said. "Look at Russia though, Nico was ahead all the way to turn one, so I need to think of a different approach for tomorrow I am wary of all the things that could happen. I think about all the different scenarios of whether I will be behind in turn one or beside or on the outside... I look at all those and make sure I've got them covered."

However, Rosberg is confident he will be able to hold Hamilton off as he did in Russia.

"It depends, In Sochi for example, we saw that once Lewis came out of the slipstream... he just stopped there and from then on we had the same speed all the way down. It's a little bit harder maybe than on other tracks but not a major difference."