Max Biaggi has more than doubled his World Superbike Championship lead after cruising to his seventh win of the season at Misano while Leon Haslam limped home in eighth.
The Aprilia rider held station behind long-time leader Troy Corser for two-thirds of the race before pouncing into a lead he wouldn't lose with nine laps remaining.
Crucially, with Haslam only managing a distant eighth after failing to recover from a poor start, Biaggi's maximum points' haul has seen him extend his advantage to 32 points in the overall standings.
Having given BMW its first pole position during qualifying, Corser turned his grid advantage into an early lead, followed by Biaggi, Checa, Sylvain Guintoli and Michel Fabrizio.
Haslam, meanwhile, suffered a poor opening lap, getting shuffled down to ninth after being run out wide by Guintoli through the first bend, the erstwhile series leader caught behind Jonathan Rea, who had turned his 16th place starting position into an early eighth.
Haslam would promptly relieve Rea of the position on lap three, but with Cal Crutchlow and Noriyuki Haga all tripping over one another in the battle for sixth, the top five made a swift break.
The gap between the two groups was widened further when Crutchlow, having passed Haga for sixth, low-sided into retirement on lap four.
The leading group would slim to three as Corser attempted to make a break mid-race, the Australian being chased by Biaggi and Checa, while Fabrizio and Guintoli began to fade.
The battle for the win, however, would come down to a ten-lap sprint, sparked when Biaggi swept past Corser on lap nine. Although Corser got his rival back almost straight away, another shuffle would see Biaggi emerge out front.