We saw a mesmerising battle between the two Mercedes drivers, during which they had to balance their desire to beat each other with the need to get the most out of the tyres in these very high temperatures. Ambient and track temperatures were certainly higher than everybody anticipated, which caused some degree of blistering and graining, particularly at the start of the race with heavy fuel, soft tyres and the hottest temperatures of the day. This did not however affect tyre performance. The new surface created a number of challenges for everyone all weekend, including the teams, the drivers and ourselves. Most drivers went for a three-stop strategy, which we predicted to be the fastest around Interlagos. However, Kimi Raikkonen made a two-stop strategy work as well, at one of the most demanding races of the year.