Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Mercedes dominated free practice at Formula One's season-opening Australian Grand Prix on Friday, with Nico Rosberg edging his world champion team-mate Lewis Hamilton to top the timesheets in both sessions. German Rosberg, last year's championship runner-up, set the fastest lap of 1:27.697secs in the second session on a glorious day at Albert Park, topping Hamilton by one tenth of a second. Rosberg was also quickest in the first session, his best time of 1:29.557secs edging Hamilton as the constructors' champions carried their ominous form from winter testing onto the track. Nico Rosberg made a flying start to his season as he topped the timesheets in both practice sessionsMercedes dominated the practice sessions in Melbourne on FridayNico Rosberg finished ahead of rival Lewis Hamilton in both sessionsMcLaren duo Jenson Button and Kevin Magnussen struggled with the Dane crashing out of FP2Sebastian Vettel was third on his debut for Ferrari in the second session 
 Question:_'s McLaren is winched away by a tractor after he skidded into the gravel ain the second session.

Kevin Magnussen