The 41 year-old, who came in at his lightest career weight, looked a cut above all of his opponents as he stopped Bertino and Rossy either side of a dominant points win over old rival Rogan.
Harrison is now back in British title contention following the victory, in which he took home £36,000, including his stoppage bonuses and could be in line to fight for the vacant Lonsdale belt if David Price losing the title on the back of his first defeat.
On the undercard, former Team GB captain Thomas Stalker eased through a four-round debut against perennial journeyman Kristian Laight to score a comprehensive points win.
The 2012 Olympian is set to be kept busy by new promoter Eddie Hearn, with the 28 year-old expected back in the ring in just five weeks’ time on March 30 at the Echo Arena.
