Reigning World Superbike champion Toprak Razgatlioglu completed a hat-trick of victories at Misano by winning the second feature race.
The BMW rider, 28, also won Saturday's opening race and Sunday's Superpole sprint race.
From pole position, Razgatlioglu dominated the third and final race of the weekend to move within nine points of championship leader Nicolo Bulega.
The Turk will transfer to the MotoGP series in 2026, having signed a deal to ride a Yamaha for Prima Pramac Racing.
From starting 10th on the grid, Italian Bulega finished almost 10 seconds behind, with Ducati team-mate Alvaro Bautista in third place.
Northern Ireland's six-time champion Jonathan Rea was running in ninth position when he crashed out with 12 laps remaining.