Hartford, CT -- (Sports Network) - Chad Dawson retained his IBO light heavyweight title and gained the vacant WBC interim belt with a unanimous decision over Glen Johnson, whom Dawson beat in April, 2008.

The fight went the distance, but Dawson (29-0, 17 KOs) won with scores of 115-113, 115-113 and 117-111. Johnson's (49-13-2, 33 KOs) last two defeats have come at the hands of Dawson.

This marked Dawson's second title defense, while Johnson fell to 3-6-1 in his 10 career title fights.

In their first fight, the now-27-year-old Dawson was also a unanimous winner over the now-40-year-old Johnson. All three judges in that bout scored the fight 116-112.