Ducati man Bautista looked on course for his second win of the weekend in Portugal after passing Rea for the lead on lap 14 of 21, but came under renewed attack from his Kawasaki rider in the closing stages.
Rea failed to make a move stick at either of Estoril's most obvious passing points, the Turn 1 right-hander and the Turn 6 double left-hander, but launched an ambitious assault on Bautista into the downhill right-hander of Turn 7.
