By Sportsmail ReporterPUBLISHED: 02:35 EST, 6 May 2012 | UPDATED: 04:08 EST, 6 May 2012 Floyd Mayweather Jr added the WBA Super World light-middleweight title to his supreme career roster with a battling unanimous points victory over Miguel Cotto in Las Vegas.Mayweather, fighting at the 154lbs limit for the first time since defeating Oscar De La Hoya to win the WBC belt exactly five years ago, won favour by margins of 118-110 and 117-111 (twice) on the judges’ scorecards to preserve his unblemished 43-fight record. Still the champion: Floyd Mayweather celebrates after beating Miguel Cotto Defending champion Cotto, unbeaten in his previous three bouts at light-middleweight, enjoyed moments of success with brutal spells of inside pressure, but slips to 37 wins and three defeats as a a professional.Attentionswill once again turn towards the prospect pairing Mayweather with pound-for-pound rival Manny Pacquiao, but the 35-year-old American must first serve a three-month prison sentence after pleading guilty to a domestic violence charge. Respect: Cotto hugs Mayweather after their fight at the MGM GrandMayweather’scrisp left jab was the defining feature of the opening round, while thechallenger showed he was willing to trade at close quarters as Cotto increased the pace and physicality of the contest in two.By the fourth Mayweather was starting to unfurl the whole repertoire and a stinging left uppercut momentarily buckled the champion’s legs. Landing a blow: Miguel Cotto impressed many observers in Las VegasCottolanded a meaty left hook in five as he relentlessly burrowed forward and the 31-year-old Puerto Rican enjoyed his best three minutes to date in round six, drawing blood from the nose of his opponent who appeared to be feeling the relentless pace.Anabsorbing ebb and flow continued across the subsequent two sessions, asMayweather’s slick backfoot work gave way to another dose of Cotto’s frenetic pressure. Bruising: Mayweather lands a punch in Las Vegas on Saturday night The champion managed to impose his style down the stretch, regularly pulling Mayweather out of his comfort zone and into the trenches.ButMayweather’s dazzling defensive and counter-punching skills came to thefore in the final two rounds, as he sealed an eighth world title acrossfive weight divisions. Receiving instructions: Floyd Mayweather in his corner during the fightSpeaking to US broadcaster HBO after the fight, Mayweather stated his desire to face Pacquiao next and suggested the bout might have already taken place but for the presence of the Filipino’s promoter, Bob Arum.’This fight right here, I was looking to fight Manny Pacquiao,’ he said. ‘The fight didn’t happen, I don’t think the fight could happen because of Bob Arum. Bob Arum was in the way – he stopped the Pacquiao fight.’Let’s give the fans what they want to see. They want to see Mayweather-Pacquiao.’ Justin time: Bieber holds up a belt for Mayweather before the fight Celebrity friends: Justin Bieber, Rapper Lil Wayne, Mayweather and rapper Curtis ’50 Cent’ Jackson pose after the fight