LAS VEGAS : Argentine Formula One rookie Franco Colapinto is uncertain for Saturday's Las Vegas Grand Prix after crashing heavily in qualifying. The 21-year-old Williams driver was taken to the medical centre after he hit the wall during the second phase of Friday night's session, the impact wrecking his car and scattering debris across the track. "Franco sustained a significant impact of over 50G, requiring a medical check up," the team said in a statement. "An impact of this magnitude is