#2 United States Grand Prix 2015
The second season into Mercedes' pure dominance saw Hamilton and Rosberg both battle for the driver's title.
At this point, both the Brit and the German were seen as enemies when out on the race track.
Rosberg was bidding to achieve his first world championship win by gaining revenge over his teammate.
But at the 2015 United States Grand Prix, Rosberg's championship chances were hanging by a thread.
Rosberg was 73 points behind Hamilton going into the race at the Circuit of the Americas as there were only four races left.
Vettel, at the time, was second in the driver's championship by being 66 points behind Hamilton but would eventually be taken over by Rosberg.
All Hamilton had to do to get his hands on a third driver's title was gather nine more points than Vettel and two more than Rosberg at the Grand Prix.
Hamilton would go on to win the race as Rosberg finished runners-up and Vettel completing the podium in third.
It was a frustrating result for Rosberg as he showed in the driver's lounge when throwing his 2nd place podium cap towards Hamilton.