( CNN ) -- World champion Casey Stoner boosted his hopes of defending that title with victory at an incident-packed Dutch MotoGP at Assen Saturday . A first corner accident saw San Carlo Honda Gresini 's Alvaro Bautista end the hopes of title leader Jorge Lorenzo , the Yamaha team leader clearly unhappy at the premature end to his race . It left the Hondas of Stoner and Dani Pedrosa to dominate affairs with Lorenzo 's teammate Ben Spies in pursuit . Stoner took a lead he maintained to the checkered flag , closely followed home after a thrilling duel by Pedrosa . Andrea Dovizioso in the Monster Tech Yamaha overhauled Spies for third . His teammate Cal Crutchlow of Britain continued his fine season with fifth , just ahead of former world champion Nicky Hayden of the United States on his Ducati . 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 . Stoner , who had started on pole , has pulled level with the unfortunate Lorenzo at the top of the overall standings . Bautista is under investigation after the crash and apologized to Lorenzo for ending his chances . `` At the end I arrived so fast into the corner and I tried to stop the bike to stop Lorenzo from dropping out . I 'm so sorry for him , '' he told BBC Sport . Spain 's Marc Marquez , riding a Suter won the Moto2 category race , while his compatriot Maverick Vinales was first across the line in the Moto3 race on his FTR .
World champion Casey Stoner wins MotoGP at Title . Assen leader Casey Stoner crashes out on second bend . Dani Pedrosa finishes first with Andrea Doviziosa third . Stoner draws level with Lorenzo at top of the standings .