Chaz Davies (Ducati)
Image credit: Getty Images
Davies, who finished third in Race One, produced a dominant display to fend off challenges from Michael van der Mark and Alex Lowes (both Yamaha), who finished second and third respectively.
Final lap: Chaz Davies earns first win of 2018
Rea looked uncomfortable on track throughout, but still climbed above Marco Melandri (Ducati) to take the championship lead.
The Northern Irishman grabbed pole position in a record time before coasting to Race One victory, but was off the pace on Sunday as he finished over six seconds adrift.
Rea (69 points) leads Melandri (67) in the standings. Xavi Fores (Ducati) is third (60) with Davies (57) climbing into fourth.