LAS VEGAS — Chad Dawson successfully defended his IBF and IBO light heavyweight titles Saturday night, unanimously outpointing Antonio Tarver in a rematch of their October fight. Dawson (28-0, 17 knockouts) looked lackadaisical at times in fighting off several impressive combinations from the Tampa resident. But two judges scored it 117-111 while the other scored it 116-112. Unlike their bout in October, when Tarver was dominated in a 118-109, 117-110 and 117-110 loss, Saturday’s fight at the Hard Rock Hotel and Casino produced plenty of back-and-forth action from start to finish. Saturday marked the first time Tarver (27-6, 19 knockouts) lost a rematch. Previously, he avenged losses to Roy Jones, Glenn Johnson and Eric Harding. Tarver fought back more than in the first meeting, when he lost the title to Dawson. The 40-year-old was more active than the 26-year-old Dawson, throwing 749 punches to Dawson’s 677. Dawson still landed more however, 209 to 121. Information from the Las Vegas Sun contributed to this report.