Karel Abraham claimed a surprise Moto2 victory in the season finale at Valencia after champion Toni Elias collided with Andrea Iannone on the last lap.
Iannone had been battling for the lead with Julian Simon - his rival for the runner-up spot in the championship - for most of the race, with Abraham and Elias right on their tails. But when Elias' aggressive move on Iannone on the final lap scattered the pack, it was Abraham who came through to take his first win at world championship level.
Polesitter Elias had earlier fallen to fifth at the first corner of the race while trying to fend off the faster-starting Iannone.
The Italian then edged away while Kenan Sofuoglu and Stefan Bradl fought over second - a contest which came to a head after seven laps in a Turn 1 incident that left an angry Sofuoglu skating through the gravel. He eventually fell, and retired soon after, while Bradl did not last much longer before crashing by himself.
Simon had fallen to 11th off the line, his qualifying having been hampered by electronic problems, but he carved through the field and took second from Bradl just before the German crashed.
He then caught Iannone and started a battle that saw them exchange the lead eight times, while Elias and Abraham pulled off some ferocious moves on each other just behind.
On the last lap, Elias slid down the inside of Simon to take second but then speared into Iannone. As Elias crashed out, Iannone somehow kept his wobbling bike upright, but Abraham took advantage of the incident to sweep past both Simon and Iannone and claim the win.
Iannone beat Simon to second, though the Spaniard held on to second in the championship.
Tom Luthi just missed out on a podium spot as the last-lap mayhem unfolded. Scott Redding drifted away from the lead battle but resisted Alex de Angelis for fifth.