World champion Casey Stoner wins MotoGP at Assen . Championship leader Jorge Lorenzo crashes out on first bend . Hayden 's teammate , seven-time champion Valentino Rossi , continued his disappointing season back in 13th after being forced into the pits for a late tire change . Dani Pedrosa finishes second with Andrea Doviziosa third . Stoner draws level with Lorenzo at top of the standings .
World champion Casey Stoner wins MotoGP at Assen . Championship leader Jorge Lorenzo crashes out on first bend . Dani Pedrosa finishes second with Andrea Doviziosa third . Stoner draws level with Lorenzo at top of the standings .