Rosberg complains about ERS

Mercedes driver Nico Rosberg believes that an Energy Recovery System (ERS) error was the main cause for his defeat at the hands of teammate Lewis Hamilton in the Formula 1 United States Grand Prix.

"I made a mistake because I used the wrong thing to get more ERS. When I saw him coming I decided to go for extra boost, but I never got it," Rosberg was quoted as saying by Xinhua.

"I thought I was using the right thing but there was a delay in that one. If I did it with a button, it would be immediate but with a switch there is a delay, so I never got the extra ERS," said the German, who started from pole but surrendered the lead to race winner Hamilton.

Rosberg added, "I had a big drop off, which is why in the last metres he got a good jump on me. So that was a mistake that I didn't know about."

The result further widened the gap in the drivers' standings between the second-placed Rosberg and leader Hamilton, who now has a 24-point advantage heading into next weekend's Brazilian Grand Prix.