Nico Rosberg has described the performance of Sebastian Vettel’s Red Bull as “crazy”.

After a disappointing weekend of pace in Austin, the Mercedes driver admitted that watching onboard footage of F1’s dominant champion did not cheer him up.

“I just sit and think ‘Are you crazy? How does that work?'” Rosberg told the German newspaper Bild. “What Sebastian’s car can do in the corners is click here for more