However, the his race would last just a handful more corners before a technical issue with his Ducati forced him into pitlane at the end of lap two to complete a clean-sweep of non-finishes in America.
Rea ran Davies close in the opening laps, keeping his advantage at under a second. But by lap seven, the Ducati rider slowly started to extend his lead.
Davies continued to open up the gulf between himself and Rea to over three seconds to cruise to the chequered flag.
Rea consolidated second place to extend his championship lead to 81 points over Bautista heading into the seven-week summer break.
Razgatlioglu finished a distant third, securing his sixth podium of the season, with Yamaha's Alex Lowes just over half a second ahead of the chasing Tom Sykes (BMW) in fourth.
Leon Haslam hounded Sykes in the closing stages after the BMW rider made a mistake exiting Turn 6, which allowed Lowes through, but could do nothing to usurp him and was sixth.