Mexican driver Sergio Perez, was in a serious accident in qualifying before the Monaco Grand Prix in 2011, escaped with a slight concussion and a dislocated hip. Fortunately, fractures and internal injuries avoided. Recall that the Sauber driver lost control on the car during braking before the chicane after the exit of the tunnel, resulting in a high speed hit a barrier on the side. Arrived on the scene, doctors and emergency services removed the 21-year-old pilot from the cockpit, and sent him to the Hospital Princess Grace in Monaco, where Sergio will be held under the supervision of doctors tonight. Tomorrow morning Perez waiting another survey, but because of the resulting concussion driver will likely not be allowed to start the race.