Parker, who won the first fight back in May by a controversial split decision, won this morning's bout far more decisively, by at least two rounds on all three judges scorecards.
The former WBO heavyweight champion was particularly strong in the first half of the fight, with Chisora given a standing eight count on three occasions, in rounds three, seven and right.
But to Chisora's credit, he stayed in the contest, refusing to go down, with Parker unable to finish off the fight.
"I just felt like it was a continuation of the first fight," Parker said.